The same battery weight will give the same run time, assuming the same speed. Example, for a certain speed requiring 2000 watts use 4S pulling 135 amps, or 6S pulling 90 amps. A 4S/6000 mAh pack will last 130 seconds, a 6S/4000 mAh pack will last the same time. Using 6S lowers the amp draw substantially as long as the boater exercises restraint in prop size.
In this case the amp draw depends on the prop used with each motor, there is no reliable way to accurately calculate what the amp draw will be, just rough estimates. Using the maximum amp draw value given by the motor maker is a wasted effort, a cheap motor will have a lower maximum (assuming the maker isn’t lying) than an expensive motor, it tells you nothing about actual amp draw.
BTW the 1527 is way bigger and heavier than required, but since the OP has it....
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