Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -rb5accb82ac043938255883b6c60a6f81795569b0 -r0798ef0a54e4ddaa551ced7b2bd9b032aa458095
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision b5accb82ac043938255883b6c60a6f81795569b0)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision 0798ef0a54e4ddaa551ced7b2bd9b032aa458095)
@@ -44,7 +44,11 @@
 // ********** private definitions **********
 
 #define MAX_TREATMENT_TIME_MINUTES              ( 8 * MIN_PER_HOUR )                        ///< Maximum treatment time (in minutes).
+#ifndef ALLOW_1_MIN_TREATMENT_DURATION
 #define MIN_TREATMENT_TIME_MINUTES              ( 1 * MIN_PER_HOUR )                        ///< Minimum treatment time (in minutes).
+#else
+#define MIN_TREATMENT_TIME_MINUTES              ( 1 )                                       ///< Minimum treatment time (in minutes).
+#endif
 #define MAX_DIALYSATE_VOLUME_ML                 ( 150 * ML_PER_LITER )                      ///< Maximum dialysate volume (in mL).
 
 #define USER_CONFIRM_CHANGE_TIMEOUT_MS          ( 60 * MS_PER_SECOND )                      ///< Require user to confirm UF volume change within this time.