//If the time fields are already in a time format

//Create a formula to subtract the Start Time from the End Time (this gives results in seconds):

​

{ENDTIME.EN_US} - {STARTTIME.EN_US}

​

//If the time fields are in string format then

//Create a formula to subtract the Start Time from the End Time (this gives results in seconds), but within the formula convert the string to time format using the Time function.

​

Time({ENDTIME.EN_US}) - Time({STARTTIME.EN_US})

​

//If you would like to see the number of minutes, divide the above formula(s) by 60.

//If you would like to see the number of hours, divide the above formula(s) by 120.