How many hours a day would my turtles need the heat lamp?

I have 2 lamps BUT one light burned out, and I have a vet visit for my dog in a bit and cant replace the bulb for a while.

I was wondering if theres a way I could swap the lamp out until I recover from the vet, and buy a new bulb?

I have a painted turtle, and a red ear slider.
Update: I mean this in the politest way possible. Why did you answer my question if you dont have the answer?
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