Like WV said, it's pretty much a personal preference. I usually like to pull them out 2 or more at a time. But it also depends on how much trouble they are making inside the incubator. The first usually snuggles up to a pipped egg and goes to sleep, so I'll leave it to keep encouraging the pipped eggs to progress. But if they are rambunctious and playing soccer with the pipped eggs then they come out and go straight into the pre-heated brooder.
The newest one is exhausted of course trying to sleep the other one is bouncing around way playing leap frog since it came out last night humidity is at almost 90% thinking of leaving them until later today/tonight to see if more pop but it's crowded and getting more so w/ empty eggs and bouncing babes lol