We put a fresh cover on in the morning, and then reuse it until DS poops. So we use usually 2 covers during the day (one pre-poop and one post-poop). We use thick prefolds, so the cover is usually hardly wet (if at all) Although, if the leg gussets feel wet, I change it out.
I usually use two, one in the morning until afternoon nap, then switch to a new one. I keep that on until bedtime then switch to his nighttime diaper cover.
Re: Covers
Make a pregnancy ticker