I'm ready to hatch eggs in my kindergarten classroom. A parent brought in fertile eggs this afternoon, and the incubator is good to go. However, I just realized that if I start the eggs right away, 21 days from now, my class will be gone all day on a field trip. I think I'd like to wait for 2 days before I start these eggs in the bator. So, will that work? Can I just leave them sitting out on the table in the classroom until Thursday?