It's more about turnover intervals than it is with run time. The general idea is to mix the water together, and the size of the BOW and the aerator in question will determine the needed run time to adequately
mix the entire water column.

Also, aerating only during the day may raise the water temps.....nighttime aeration is sometimes employed to try and prevent this from happening. (Cooler air temps after sunset)

How far from power are you? It's pretty cheap to run air, instead of electricity. Is is feasible to place the compressor at the power location, and bury an airline to the pond?

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.