Parking Timer

This alerts you when you need to leave somewhere like a store to get back on time (e.g. to a car park with a time limit).

It alerts you when you need to leave, including warning you before hand. It will also alert you when you need to be back.

All the notification sounds are individually customisable, as is how much warning you get before you need to leave.

And of course, it is much more versatile than just that...