BLDC Motor Driver (3 Phase Inverter) - Switches Delay

Hello Guys

I am designing a Three Phase Inverter for driving a BLDC Motor. There are 6 switches (MOSFETs) in the circuit. I am having a problem in determining the delay between each switch triggering.

I need to know what should be delay between each switch when my output waveform required frequency is 50Hz.

Please assist