How to make a CHEAP month long timelapse?

[Major nc]

I've spent too many hours trying to figure this out. Need help. Would like to use an action cam outside the tank.
Things I need.
Action cam that can be wall plugged
Or regular compact
Intervalometer that plugs in.
1 or 2 hour interval shots. With scheduling, so you don't shoot when lights are out.
Compatible software for pc
Every camera I looked at only has a maximum of 1 shot every 60secs. Thats too fast. Looking for 1 shot every 1 or 2 hours. Hopefully someone has a thread on this already.