Time Difference Example

I am still new to bubble, and while I can usually figure things out after many hours, calculating the time difference between 2 dates & times has alluded me.

To help me and others, I created a simple example for all to reference. I hope that the smart people like @NigelG might be able to help with the formula, because it is currently a question mark.

Example Here

Hey go ahead and try it. I edited the formula.