When I was incubating my eggs, I turned them three times a day. One before school, one after school and one before bed. I just put an 'x' on one side, and an 'o' on the other and did a full half turn. It worked out for me. After cracking open the eggs that didn't hatch, only 3 died at some stage of development, the rest were infertile. But you could also do a quarter turn every few hours 3 - 4 times a day also. Just remember not to turn the eggs during lockdown.
