Well. You should start out w/ less holes and run a humidity test. Too humid, just add more holes accordingly. It's easy to add more holes and more difficult to take away, so be careful.
I have a rack so there's no lids on my tubs. I do 5 evenly spaced holes on each sides of the tub.
Back when I didn't have a rack and only had stand alone tubs with lids, I put more holes. I did 2 rows of holes exactly 1 inch apart on all 4 sides of the tub and had perfect humidity.
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