Is there a way to schedule a render? I have a very long render and I was wondering if there is any way to make it only render at night so I can still use my computer during the day.

Edit: this is a single frame render, it will probably take upwards of 30 hours because it will be at 12k, 4096 samples, and has many polygons.
Start to render when you go to bed?
If the render is not completely done in the morning, just continue from the last frame of the previous render session.

If that's not enough of an answer, please provide more info.