how long do you run the pump
 

how long do you run the pump and how long between periods of running the pump

You run the pump as long as it takes to raise the water level to the desired height in any kind or size of ebb and flow garden. So it will depend on two things.

How big your garden is. ( a bigger garden will naturally take longer to fill. )
The size of your pump. ( a smaller pump GPH will naturally take longer to fill your garden.)
So you wet the roots, however long that takes, ( see formula above) every 15 or 20 minutes as long as your lights are on.
Is that to hard to understand. If so get on your knees and go back to dirt.