This is definitely against popular opinion, but sometimes I take them out shortly after they have hatched, particularly if they’re super active and bowling all the eggs around as I have a very small incubator (Brinsea Mini Advance). The disclaimer is that I know what I’m doing and have a lot of experience with it, it’s quite humid where I live, and I don’t actually remove the lid - I wait until the chick is right next to the edge, then quickly lift the edge a tiny bit and take it out using the smallest gap possible. Because of the dome shaped design of this Brinsea, most of the humidity isn’t lost as long as long as things are done quickly. I have never had a shrink-wrapped chick that I’ve had to assist yet with this technique.
That being said, if you are an inexperienced or have a different incubator it is much better to wait until everyone has hatched as you can cause yourself a lot of trouble if you keep going in and out of the incubator during lockdown. Understand that intervention during lockdown can put the lives of any unhatched chicks at risk. If I am not hatching my own eggs or ones that I know the health/hardiness of, I will not take the risks mentioned above.
Usually mine aren’t in for more than a couple hours - often only until they start moving around. I’ve never yet had a hatch span more than 24hrs, but I know many people who do and leave the chicks in during that whole period