The whole point of using water bottles is that they hold their temperature much longer than the air inside the incubator, so it also takes longer to get cooler bottles of water hot. The fan is needed to prevent hot and cold spots, which you will see without a fan. If it takes that long to heat up, and the fan cools it off too much, the problem is that you don't have enough heat being supplied. You have to add more heat tape. I like to use enough to heat an empty incubator up to 90 degrees, with fans running, in under an hour, in a room that is in the low 70s. It will always take longer if it is filled with room temperature water bottles, but it shouldn't take more than a couple of hours to get them up to 90. If it's taking longer than that or you can't get it past 88, you need more heat tape.
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