Welcome to BYC
I turn 3 times per day minimum. A hen turns her eggs well over 5 times daily, so it's very unlikely to 'over turn'. Whatever it should be,
turn an odd number of times so that during the night, the eggs will not be on the same side they were the night before. If you have school
or work, I'd turn them before I leave, when I get home, and right before bed and that will be good. I've read and heard many people who only
turn once a day, and have good hatch rates, but the eggs in a hen's nest would be turned into the double digits. So IMO more is better. The
longest I leave my eggs un-turned is about 10 hours - through the night. I turn right before bed, and right when I get up. If you are worried
about forgetting, (believe it or not, I have forgotten my eggs before) or not having time to turn, get an auto turner. Good luck