I know I can't candle too much! I'm thinking every 3 days up until day 18! I have seen a lot of guides that suggest candling that much... Plus I have it down to a really quick art! The eggs aren't really dropping in temp plus the incubator only dropped one degree while I did all of them! Since I'm using an ice chest the lid lays flat so I can crack it, grab an egg and then close it while I candle! It only takes me about 15 seconds to do the whole process including getting the egg back in! Before I set my eggs I practiced with a store bought egg to get it down to a science! I know I'm silly but it is working so far!!!!!! :-D