I've been incubating my eggs at 86-87 because I am using a chicken incubator and I am not around during the week to check on them constantly. I was afraid there might be a heat spike because they are an upstairs room that sometimes gets hot. I did buy an AC for the room but my sister can't seem to remember to close doors so it doesn't always help. The eggs have been pretty steady at 86-87 (sometimes reaching 88-89) with 88% humidity. They still look great. When I candled them yesterday at day 52 the babies didn't look very big, filling maybe half of the egg.
What is the usual incubation period for 86-87 degrees? I know at 89-90 it's about 55-60 days. I have tried googling this, but since most incubate at 89-90 it's been hard to find an answer.