Arduino Uno R3 + serve & timer (8hour)

This is my first time working with an arduino, i’m builing an automatic fish feeder.

The servo needs to turn from 5 degrees to 175 and back three times, with an interval of 8 hours.

Could anyone tell me how to change the code and make it work?

Arduino_Fisf_feeder_8_uur.ino (662 Bytes)