I've done several staggered batches. I also have 2 incubators. My first staggered was as soon as the Christmas chicks hatched, I did a quick cleaning of the 2nd bator and put in the New Years chicks. The two sets of chicks were fine in the same brooder. But then I hatched some chicks last week, and those chicks were almost too small to put in with the earlier ones. But, I kept an eye on them. Now, I'm hatching more this weekend, and I will need to find another spot to brood these. The other group is just too big to mix them. So, hatching is fine, it's finding a spot to put the hatched chicks that might become problematic. I would give yourself at least 5 days for the first group to hatch, and for you to clean up the 'bator, before your next group is ready to go in. You are at a week, so that is a perfect amount of time. Good luck and happy hatching!!