Battery parameters for 1 Hour mower drive?

Hi,

Im seeking advice on the battery parameters do drive those 2 motors on low speed for…1 hour as a mower.

Is there any way to estimate power consumption of those motors?

Im planning to build 18650 power bank.

Thx!

Motors:
(WT36V20200427 JDBER1, 36V
not sure aboute the power 250W/350W?)