Usually up to 24 hours from PIP to ZIP. If you can see the chick's beak, it may appear to be smacking it's beak, this means it is still absorbing the yolk and making itself ready for the next step. 🙂
Yes! It’s just about perfect. As others have stated, humidity will go up as the eggs hatch and then you really won’t need to add any more water at that point.
What is the brand of your outside thermometer? Brinsea tend to be quite accurate and I would trust the Brinsea over the outside one, especially if it was not calibrated before you started your hatch.
Do you have a non-digital thermometer at home that you could put in and see if it is the same?
Which incubator do you have? Is your extra thermometer calibrated?
Do you have another thermometer you can try? You can even try a non digital human thermometer, these tend to be very accurate