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It can take 24 hours or longer for some chicks to go from pip to hatch. I understand your pain as I am in the same situation at the moment. I am on day 20 and have a pip that I have been watching all day. Yes the little crack is the pip. #1 rule, don't open the incubator unless there is an emergency during lockdown. The rush of air can shrink wrap a chick in a matter of a couple of minutes. If your humidity stayed steady I am sure you are fine. I have a 7 year old that I have caught several times trying to go to the incubator. I cringe every time she does. At least if I am with her I can keep her from touching the incubator.
With any luck, you will wake to a new born chick tomorrow.