different people believe in having it at different levels so not a easy question to get an answer to. I had mine that high last hatch and had a few drown. I am hatchinging right now at 55% and it is going good so far. It also depends on the kind of incubator you have I think.
thanks for the imput. we kept it between 35 and 45 up until day 18. I thought i saw somewhere to raise it after day 18 to at least 70%. may take mine down a little just to be safe.