Run times are related to the total gallons of your pool and influx of debris. This becomes more complicated with multi speed pumps.   Most pool professionals agree that at the very least 1 turn over a day and up to 1 ½ turnovers a day in warm weather or high usage.  There are conditions that will require more run time. Many pumps today show GPM flows on the on the pump control pad or phone app at the rpm they are running at. If you do not know the total gallons of your pool multiply the length times width times average depth times 7.5 (L x W x avg depth x 7.5) = total gallons.  If you have an in-floor cleaning system, the GPM when the pump is running is approximately 65 GPM alone not counting water feeding other water features, spa over flows and other items that may be running at the same time.
The Paramount ClearO3 will sanitize 50,000 gallons in 8 hours and the Ultra UV2 on a one lamp unit sanitizes up to 48 GPM., 2 lamp unit up to 80 GPM., and the 3-lamp unit (must have a minimum of 2 ½ inch plumbing going into two inputs and out of 2 each outlets) up to 120 GPM.
The above run times are general guidelines. There are always exceptions to run times; water temperature, weather, bathing load, and landscaping. The run time will need to be adjusted up or down to meet these variables.