My broody was off the nest for 4 hours today and the eggs would be about day 17. She wanted to be free ranging so bad and I couldn't get her back in (first have to keep an eye on the rooster, then I wasn't going into the tall grass for her). I'm hoping this didn't affect the eggs too badly. I don't know what I'll do with the chicks...Hen house is sized for 16 and I've got 16 (provided no deaths). I guess I'll make a decision once I see how many actually hatch.
CG
If its warm where you are the eggs should be fine. My girls go out and dust bathe, eat, drink, poop and then return later. They don't usually leave for very long but they set their own schedules.