Making a 7-hour timer-based relay
cant understand how to program it for such purpose so please help me out


it is fairly easy to approach such questions:

1) you can program any?

2) can you program this mcu to blink an led?

3) can you program this mcu to do short time counting?

4) can you program this mcu to do long time counting?

what you help helps you the most depends on your  answers to those questions.