The larger the hot tub, the more power and electrical current that is needed. When you go up to three or four pumps, you may be looking at a 40-amp feed. There is no such thing as a 32-amp hot tub.
32 amps is the amount of power that is required to run a standard hot tub that will have a heater and a couple of pumps running simultaneously. With a 32 amp, you could use it for three or four hours and your heater won’t turn off and the temperature will remain the same.