Brake resistor size for BMS1060

My lab is building an agricultural robot recently. We bought the BMS1060 for battery management. I looked through the datasheet and wonder how to select an appropriate brake resistor. Our setup is to use 12 3.2V 60 Ah Lipo cells to drive 4 615W brushless motors. Could you have any recommendations for the size of the brake resistor? Looking forward to your response. Thanks in advance.