They can stay in the bator for 2-3 days. I personally, remove my chicks from the incubator to the brooder after they have warmed up and are active. I keep my humidity up there (75%+) during hatch so that I can open the bator w/o worrying about jeopardizing any pippers. Many people feel that you...
That's great. What day are you on now? Bantams are known to be a day or two early, just in case you didn't know and get more freaked out if the other's aren't right behind...lol
What kind of incubator are using? It all depends on how long they were at that temp. The eggs take longer than the air to cool down or warm up. If the spike happened just before you returned and were able to correct, then there is hope. If you were gone for several hours and the spike happened...