diff --git a/backend/app/connect.py b/backend/app/connect.py
index 63eebf6..d8ac1ee 100644
--- a/backend/app/connect.py
+++ b/backend/app/connect.py
@@ -175,7 +175,7 @@ def nodes_in_bfs_order(self):
         # create the dictionary
         for node in self.canvas:
             # create node
-            nodes_list[node["id"]] = Node(node["id"], node["queueType"], node["priorityFunction"], node["numberOfActors"],
+            nodes_list[node["id"]] = Node(node["id"], node["queueType"], node["priorityFunction"], node["numberOfActors"], node["distributionFunction"],
                                             process_name=node["elementType"], distribution_name=node["distribution"],
                                             distribution_parameters=node["distributionParameters"], output_process_ids=node["children"], rules=[],
                                             priority_type=node["priorityType"])
diff --git a/backend/app/models/node.py b/backend/app/models/node.py
index ddee256..5027ec9 100644
--- a/backend/app/models/node.py
+++ b/backend/app/models/node.py
@@ -11,6 +11,8 @@
 from flask import Flask
 import os
 import random
+import numpy as np
+
 
 app = Flask(__name__)
 
@@ -20,7 +22,7 @@ class Node:
     node_dict = {}
     environment = os.environ.get("DEV_ENV")
     '''rules is a list of Rule Objects'''
-    def __init__(self, id, queue_type, priority_function, num_actors,
+    def __init__(self, id, queue_type, priority_function, num_actors, distribution_function,
                  process_name=None, distribution_name=None,
                  distribution_parameters=None, output_process_ids=None, rules=[], priority_type=""):
 
@@ -36,6 +38,12 @@ def __init__(self, id, queue_type, priority_function, num_actors,
             self.priority_type = None
         else:
             self.priority_type = priority_type
+
+        if distribution_function == "":
+            self.distribution_function = None
+        else:
+            self.distribution_function = distribution_function
+
         self.queue = self._set_queue()
 
         # create num actors and resource dict based on num actors
@@ -50,6 +58,24 @@ def __init__(self, id, queue_type, priority_function, num_actors,
         Node.node_dict[self.id] = self
         self.node_rules = rules[:]
 
+        if self.distribution_name == "define_your_own":
+            self._parse_d_func()
+
+    def _parse_d_func(self):
+        """
+        Helper function to help fix spacing and remove empty lines
+        Assign self.d_func to be the parse string
+        """
+        split = self.distribution_function.split("\n")
+        new_split = []
+        for line in split:
+            line = line.strip()
+            if line:
+                new_split.append(line + "\n")
+        self.distribution_function = "".join(new_split)
+        app.logger.info("parsed distribution_function func")
+        app.logger.info(self.distribution_function)
+
     def set_id(self, id):
         self.id = id
 
@@ -114,9 +140,19 @@ def _set_queue(self):
         else:
             raise Exception("This type of queue is not implemented yet")
 
-    def generate_finish_time(self):
+    def generate_finish_time(self, patient):
         if self.get_distribution_name() is None: 
             duration = 0
+        elif self.distribution_name == "define_your_own":
+            app.logger.info("d_type define your own")
+            app.logger.info(self.distribution_function)
+            duration = 0
+            l = locals()
+            # executes input code string
+            # need to pass in locals and globals to mutate _p_value
+            exec(self.distribution_function, globals(), l)
+            app.logger.info(l['duration'])
+            duration = l['duration']
         else:
             duration = Distributions.class_distributions[self.get_distribution_name()](
                 *self.get_distribution_parameters())
@@ -349,7 +385,7 @@ def insert_patient_to_resource_and_heap(self, patient, resource):
             finish_time = patient.get_start_time()
             duration = finish_time - GlobalTime.time
         else:
-            finish_time, duration = self.generate_finish_time()
+            finish_time, duration = self.generate_finish_time(patient)
         resource.insert_patient(patient, self.id, finish_time, duration)
         # record event of patient joining resource
         self.add_patient_join_resource_event(patient, resource)
diff --git a/backend/app/run.py b/backend/app/run.py
index 25b6c5a..6ee7190 100644
--- a/backend/app/run.py
+++ b/backend/app/run.py
@@ -78,7 +78,7 @@ def run(self) -> None:
                 node_rules = rule_creator.create_rules(type="node", node_rules= node["nodeRules"], node_id=node["id"], canvas=canvas)
 
             # create node
-            nodes_list[node["id"]] = Node(node["id"], node["queueType"], node["priorityFunction"], node["numberOfActors"],
+            nodes_list[node["id"]] = Node(node["id"], node["queueType"], node["priorityFunction"], node["numberOfActors"], node["distributionFunction"],
                                             process_name=node["elementType"], distribution_name=node["distribution"],
                                             distribution_parameters=node["distributionParameters"], output_process_ids=node["children"], rules=node_rules,
                                             priority_type=node["priorityType"])
@@ -93,7 +93,7 @@ def run(self) -> None:
 
             # create patient_loader node when reception is found
             if node["elementType"] == "reception":
-                nodes_list[-1] = Node(-1, "queue",  None, 1, process_name="patient_loader",
+                nodes_list[-1] = Node(-1, "queue",  None, 1, None, process_name="patient_loader",
                                               distribution_name="fixed", distribution_parameters=[0],
                                               output_process_ids=[node["id"]], priority_type="")
 
diff --git a/backend/test.csv b/backend/test.csv
index aa32313..73c9a19 100644
--- a/backend/test.csv
+++ b/backend/test.csv
@@ -1,4 +1,4 @@
 patient_id,time,patient_acuity,patient_admitted,xray,pxray
-1,2019-01-01 00:00:00.958845,1,TRUE,0,1
-2,2019-01-01 00:00:00.958845,1,TRUE,0,1
-3,2019-01-01 00:00:00.958845,1,TRUE,0,1
\ No newline at end of file
+1,2019-01-01 00:00:00.958845,1,TRUE,1,0
+2,2019-01-01 00:00:00.958845,1,TRUE,1,0
+3,2019-01-01 00:00:00.958845,1,TRUE,1,1
\ No newline at end of file
diff --git a/frontend/src/components/JSONEntrySidebarContent.js b/frontend/src/components/JSONEntrySidebarContent.js
index 4aa83ed..b5c2c0d 100644
--- a/frontend/src/components/JSONEntrySidebarContent.js
+++ b/frontend/src/components/JSONEntrySidebarContent.js
@@ -11,6 +11,7 @@ const nodeSchema = {
         "elementType": { "type": "string"},
         "distribution": {"type": "string"},
         "distributionParameters": {"type": "array", "items": {"type": "integer"}},
+        "distributionFunction": { "type": "string"},
         "numberOfActors": { "type": "integer"},
         "queueType": { "type": "string"},
         "priorityFunction": { "type": "string"},
@@ -104,7 +105,7 @@ export class JSONEntrySidebarContent extends Component {
             validatedJSON[i].patients = []
             validatedJSON[i].processing = []
         }
-        const requiredKeys = ["id", "elementType", "distribution", "distributionParameters", "numberOfActors", "queueType", "priorityFunction", "children", "priorityType"];
+        const requiredKeys = ["id", "elementType", "distribution", "distributionParameters", "distributionFunction", "numberOfActors", "queueType", "priorityFunction", "children", "priorityType"];
         // console.log(this.state.valid);
        
         for (let i = 0; i < validatedJSON.length; i++) {
diff --git a/frontend/src/components/NodeSidebarContent.js b/frontend/src/components/NodeSidebarContent.js
index 023a6a8..1c87cee 100644
--- a/frontend/src/components/NodeSidebarContent.js
+++ b/frontend/src/components/NodeSidebarContent.js
@@ -43,6 +43,14 @@ export class NodeSidebarContent extends React.Component {
             new_node.priorityType = ""
         }
 
+        if(new_node.distribution !== "define_your_own"){
+            new_node.distributionFunction = ""
+        }
+
+        if(new_node.distribution === "define_your_own"){
+            new_node.distributionParameters = []
+        }
+
         // Empty the text inside the "other" field
         if (name === "elementType" && value === "other") {
             this.setState({ tempText: "" });
@@ -280,16 +288,46 @@ export class NodeSidebarContent extends React.Component {
                         <option value="wald">Wald</option>
                         <option value="weibull">Weibull</option>
                         <option value="zipf">Zipf</option>
+                        <option value="define_your_own">Define Your Own</option>
                     </select>
+                    {this.state.node.distribution === 'define_your_own' &&
+                        <div>
+                        <label>Custom</label><br/><br/>
+                        <div style={{color: 'green', marginLeft: '20px'}}>
+                        """<br/>
+                        Set a custom duration for the patient at this node<br/><br/>
+                        Attributes available:<br/>
+                        patient.get_acuity() <br/> Returns a integer value of the patient's acuity<br/><br/>
+                        patient.get_start_time() <br/> Returns the number of minutes it took for patient to enter the simulation
+                        after the simulation started.<br/><br/>
+                        patient.get_attribute(attribute) <br/> Returns the value of the attribute for the patient as indicated by the uploaded CSV
+                        <br/><br/>
+                        """
+                        </div>
+                        <br/>
+                        <div style={{marginLeft: '20px'}}>
+                        duration = 0<br/>
+                        <div style={{color: 'grey'}}> # Set duration to the amount of time you want the patient to take<br/>
+                        # DO NOT RETURN ANYTHING IN THE CODE <br/></div>
+                        </div>
+                        <textarea
+                            type="text"
+                            name="distributionFunction"
+                            style={{marginLeft: '20px', width: '80%', fontSize: '15px'}}
+                            value={this.state.node.distributionFunction} onChange={this.handleInputChange}></textarea>
+                         </div>
+                 }
                 </div>
 
-                <div className="input-container"> {/* could indicate what parameters required */}
-                    <label>Distribution Parameters</label><br/> 
-                    <input 
-                        type="text"
-                        name="distributionParameters"
-                        value={this.state.node.distributionParameters} onChange={this.handleInputChange}></input>
-                </div>
+                {this.state.node.distribution !== 'define_your_own' &&
+                    <div className="input-container"> {/* could indicate what parameters required */}
+                        <label>Distribution Parameters</label><br/>
+                        <input
+                            type="text"
+                            name="distributionParameters"
+                            value={this.state.node.distributionParameters} onChange={this.handleInputChange}></input>
+                    </div>
+                }
                 
 
                 <div className="input-container">
diff --git a/frontend/src/models/ProcessNode.js b/frontend/src/models/ProcessNode.js
index 629b798..0502b59 100644
--- a/frontend/src/models/ProcessNode.js
+++ b/frontend/src/models/ProcessNode.js
@@ -1,5 +1,5 @@
 class ProcessNode {
-    constructor(id, elementType, distribution, distributionParameters,
+    constructor(id, elementType, distribution, distributionParameters, distributionFunction,
         numberOfActors, queueType, priorityFunction, children = [],
         patients = {}, priorityType, processing = {}, predictedChildren = [],
         nodeRules = [], resourceRules = []) {
@@ -8,6 +8,7 @@ class ProcessNode {
       this.elementType = elementType;
       this.distribution = distribution;
       this.distributionParameters = distributionParameters;
+      this.distributionFunction = distributionFunction;
       this.numberOfActors = numberOfActors;
       this.queueType = queueType;
       this.priorityFunction = priorityFunction;
diff --git a/frontend/src/redux/reducers.js b/frontend/src/redux/reducers.js
index c515bfd..d3e5a28 100644
--- a/frontend/src/redux/reducers.js
+++ b/frontend/src/redux/reducers.js
@@ -17,13 +17,13 @@ const initialState = {
     linkBeingBuilt: [], // the ID's of 2 nodes between which a link is being constructed.
     nodeCount: 5, // max ID of any node
     nodes: [
-        new ProcessNode(0, "reception", "fixed", [5], 1,
+        new ProcessNode(0, "reception", "fixed", [5], "", 1,
             "priority queue", "", [1], [], "acuity", [], []),
-        new ProcessNode(1, "triage", "fixed", [3], 2,
+        new ProcessNode(1, "triage", "fixed", [3], "", 2,
             "priority queue", "", [2, 3], [], "acuity", [], []),
-        new ProcessNode(2, "doctor", "fixed", [10], 3,
+        new ProcessNode(2, "doctor", "fixed", [10], "", 3,
             "priority queue", "", [3], [], "acuity", [], []),
-        new ProcessNode(3, "x-ray", "binomial", [1, 1], 2,
+        new ProcessNode(3, "x-ray", "binomial", [1, 1], "", 2,
             "priority queue", "", [], [], "acuity", [], [])
     ],
     // Intial state of the acuity colors