I have some that are a few days apart. My older batch is due to hatch tomorrow. Took out egg turner and separated them into groups in the bator. I simply don't turn the ones that are due to hatch and turn the ones that still have a couple days. Don't worry about opening the bator. Just don't dilly dally and watch temp once you put top back on to make sure it gets back up to the right humidity and temp. My bator has two viewing windows that pop out so I just use those to turn the eggs. That way I am not removing the whole lid. Remember, in nature, the hen does get up to turn the eggs and does get up to eat/drink from time to time.