Maybe closer to one week. Power has been out for 2 hours. Theyare clumped together in a bin in my sunroom. I put a blanket over it. Temp is about 80. I shut all the windows etc, it's 63 outside. In about 2 hours it should be light out. If power is still out I have a hen that raised 4 babies last August, I though of putting her in with them? She was a good mom. I just lost ducks to predators, I can't take losing these. They were nice and healthy, no feathers yet.