Alright, thanks!If I have a lot of eggs hatching and I have LOTS of pips and zips, I leave them in until I'm ready to move some chicks to the brooder. I don't move anything to the brooder until most of the eggs have hatched. Up to 2 days. I wash them then and throw them back in the hatcher if you still have wet chicks and eggs hatching, or into the brooder with the dry chicks you moved.
But that is me - I know other people pull them out a lot sooner.