I am trying to make a validation rule for a Call Center that insures that when a call is manually entered, that it is not incorrect. I want a validation rule that checks that the call duration is less than 5 hours. The fields are in the DATETIME format like "11/1/2016 10:29 AM".
The validation rule should be something like what is below, but I keep getting errors with the format for the time difference of 5 hours.
Call_End_Time__c- Call_Start_Time__c < 5
What is the correct format to subtract two DATETIME fields to see if the difference is less than 5 hours, what the format for the <5 hours to read correctly?