Delay Restart with Timer / Reminder

I am brand new to this application and would like to add the following functionality if possible;


The "Remind Me In’ dropdown would give the user an option for 15, 30 and 60 minutes along with the Postpone button.

Any ideas?

HUGE thank you in advance!!

This is a feature that I need also and I am new at this template. I did not have time to look into it but if someone could share some ideas, I would appreciate.