Need more info, like where you are located, are you trying to heat/cool your pool, etc. If you are having a problem, you may need to run the pump 24/7.
Many here split the run time between morning and night. You should add your bleach/other chems in the evening, and you will need to run the pump then to distribute things.
The run time depends on your Pool size and pump... you need to completely turn you water over (twice a day?). Once you calculate how long that takes, then each day just run your pump that long.
Welcome to TFP!