Is there a form / time entry survey

I have to do a cost-benefit analysis for an ongoing project.
To obtain financing, I have to prove that the task to be repaired takes a lot of time for the users.

Is there anything I can give to all users, for example, they record "Start" and record the time clicked and "End" and record the elapsed time? or the duration between the two clicks?

About 20 users will use it and will need an unlimited response fee.

I am open to suggestions: excel, access, online surveys, etc.