The resistor should dumb the "regen" power, so you have to calculate it.
It depends mostly of your hardware, of the downhill you're doing, and how "agressive" you're braking.
Have a Nice Day.
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In your calculation you don't speak about cooling. 1. Cooling by the metallic mass of the motor. 2. Cooling by the speed that air-cool your hub. 3. Cooling if your motor use a fan (drone, skate,...) motors. Cooling is very important and you have to take it into account, but often it's very difficult...