I have a spread sheet that I have created that list start and end times in
them. Could you tell me how can I have my spreadsheet to calulate how much
time was spent in the total time spent collum.

Here's an example of what I'm talking about.
Date
User Name
Start Time
Finish Time
Total Time

I want to program it so that it will tell me the difference of time between
start and finish.

Thanks.