You probably won't see that 45 second figure drop more than 5 seconds with a higher hp motor. I agree that the higher hp motor will probably turn the prop faster, but 1/3 more power won't result in 1/3 more rpm. Even if it did increase by 1/3, prop performance is non linear with rpm. All of which means I doubt that you will get more than 10% less turning time.
And as Ski notes, check for barnacles and voltage at the motor first. Heavy barnacle growth doubles my turning time.
David
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