I would say 4-8 hrs a day or more depending on how much it puts out and how much heat is needed. I would not run it at peak output, more like 25% or less of its power.So how many hours a day do you expect the turbo to run at peak output?
I can’t say eBay turbos are designed for constant peak load for hours on end.
I'm looking for under a 1,000 watts. Just enough to keep the fridge and lights on for cloudy no solar days.