How to calculate total hours

I am using the time form element in the format of one element is called "Time In" and a second element called "Time Out". both of these elements are set to 24 hour format and i need to calculate total hours. how do i set this up if it is possible?

You will need to perform calculations for that, the formula should be: 

Time Out - Time In

Here' an example: https://form.jotform.com/62244929490967 

The following guides will help you doing so: 

https://www.jotform.com/help/443-Mastering-Date-and-Time-Calculation 

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget 

I hope this helps.