Hahaha! I candle any time I want to enjoy the wonders of life!!! ok, if I have overstuffed my incubator and need to know which ones to move out to make room for good ones in the turner, I candle as early as 4-5 days. If I'm not in a hurry, I wait until day 7. Newbies may want to wait until day 10. (There is no guessing at that point). Google you tube has videos and photos of just about any day you want to see what they should look like.It's rainy & gloomy & I feel a cold coming on. Wish I could insert a poll here! Will anyone/everyone who incubates reply with what days they candle? I'm curious & trying to keep myself busy not thinking about these eggs.