Index: leahi_dialin/common/msg_ids.py
===================================================================
diff -u -r6e8e07edb4bb3f5bb387a88c37610722ff692b90 -r56ef7c146cfc502992a01f639cc9bfa0b002623a
--- leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 6e8e07edb4bb3f5bb387a88c37610722ff692b90)
+++ leahi_dialin/common/msg_ids.py	(.../msg_ids.py)	(revision 56ef7c146cfc502992a01f639cc9bfa0b002623a)
@@ -129,6 +129,11 @@
     MSG_ID_TD_PRESSURE_LIMITS_CHANGE_RESPONSE = 0x79
     MSG_ID_UI_BOLUS_VOLUME_CHANGE_REQUEST = 0x81
     MSG_ID_TD_BOLUS_VOLUME_CHANGE_RESPONSE = 0x82
+    MSG_ID_UI_DURATION_VALIDATE_REQUEST = 0x83
+    MSG_ID_TD_DURATION_VALIDATE_RESPONSE = 0x84
+    MSG_ID_UI_DURATION_CONFIRM_REQUEST = 0x85
+    MSG_ID_TD_DURATION_CONFIRM_RESPONSE = 0x86
+
     MSG_ID_DD_PISTON_PUMP_CONTROL_DATA = 0xF0
 
     MSG_ID_TD_TESTER_LOGIN_REQUEST = 0x8000
Index: leahi_dialin/ui/td_messaging.py
===================================================================
diff -u -r6e8e07edb4bb3f5bb387a88c37610722ff692b90 -r56ef7c146cfc502992a01f639cc9bfa0b002623a
--- leahi_dialin/ui/td_messaging.py	(.../td_messaging.py)	(revision 6e8e07edb4bb3f5bb387a88c37610722ff692b90)
+++ leahi_dialin/ui/td_messaging.py	(.../td_messaging.py)	(revision 56ef7c146cfc502992a01f639cc9bfa0b002623a)
@@ -650,7 +650,7 @@
 
     def td_bolus_volume_adjustment_response(self, vRejectionReason: int, vBolusVolume: int,):
         """
-        the pressure limits adjustment response message method(Msg ID: 0x81, 123)
+        the pressure limits adjustment response message method(Msg ID: 0x82, 124)
         Args:
             @param vRejectionReason         (int) : response rejection reason,
                                                     if rejection reason is 0, then accepted (0) will be sent,
@@ -669,6 +669,56 @@
         self.can_interface.send(message, 0)
 
 
+    def td_duration_validate_response(self, vRejectionReason: int, vDuration: int, vUFVolumeGoal: float, vUFRate: float):
+        """
+        the duration validate response message method(Msg ID: 0x84, 126)
+        Args:
+            @param vRejectionReason         (int)   : response rejection reason,
+                                                      if rejection reason is 0, then accepted (0) will be sent,
+                                                      otherwise rejected (1)
+            @param vDuration                (int)   : treatment duration (min)
+            @param vUFVolumeGoal          (float)   : UF volume goal (mL)
+            @param vUFRate                (float)   : UF rate (L/hr)
+        @return: None
+        """
+        payload  = conversions.integer_to_bytearray(1 if vRejectionReason == 0 else 0   )
+        payload += conversions.integer_to_bytearray(vRejectionReason                    )
+        payload += conversions.integer_to_bytearray(vDuration                           )
+        payload += conversions.float_to_bytearray(vUFVolumeGoal                         )
+        payload += conversions.float_to_bytearray(vUFRate                               )
+
+        message = CAN.DenaliMessage.build_message(
+            channel_id=CAN.DenaliChannels.td_to_ui_ch_id,
+            message_id=msg_ids.MsgIds.MSG_ID_TD_DURATION_VALIDATE_RESPONSE .value,
+            payload=payload)
+        self.can_interface.send(message, 0)
+
+
+    def td_duration_confirm_response(self, vRejectionReason: int, vDuration: int, vUFVolumeGoal: float, vUFRate: float):
+        """
+        the duration confirm response message method(Msg ID: 0x86, 128)
+        Args:
+            @param vRejectionReason         (int)   : response rejection reason,
+                                                      if rejection reason is 0, then accepted (0) will be sent,
+                                                      otherwise rejected (1)
+            @param vDuration                (int)   : treatment duration (min)
+            @param vUFVolumeGoal          (float)   : UF volume goal (mL)
+            @param vUFRate                (float)   : UF rate (L/hr)
+        @return: None
+        """
+        payload  = conversions.integer_to_bytearray(1 if vRejectionReason == 0 else 0   )
+        payload += conversions.integer_to_bytearray(vRejectionReason                    )
+        payload += conversions.integer_to_bytearray(vDuration                           )
+        payload += conversions.float_to_bytearray(vUFVolumeGoal                         )
+        payload += conversions.float_to_bytearray(vUFRate                               )
+
+        message = CAN.DenaliMessage.build_message(
+            channel_id=CAN.DenaliChannels.td_to_ui_ch_id,
+            message_id=msg_ids.MsgIds.MSG_ID_TD_DURATION_CONFIRM_RESPONSE .value,
+            payload=payload)
+        self.can_interface.send(message, 0)
+
+
     def td_pressure_limits_adjustment_response(self, vRejectionReason: int,
         vArterialWindow: int, vVenousWindow: int, vVenousAsymmetricWindow: int, vTmpWindow: int):
         """