My broody is off her nest around 30 minutes each day. You can always wait until you see a pip then put them in lockdown. I put some eggs in my incubator and forgot to mark my calendar. I took an egg out and sacrificed it to check the development. I thought I ruined my hatch and thought the eggs had been in the incubator longer so I put them in the hatcher in lockdown. When I opened the egg the chick was moving and I thought it was about 4 or 5 days away from hatching so I put the eggs back into the incubator. To my surprise a couple of day later I heard peeping in the incubator. The eggs had started hatching and some had already hatched. I put the rest of the eggs back into the hatcher. I still had a good hatch. Good luck...