The quick answer
Run time should support sanitation, mixing, skimming and filtration for the season. There is no universal hour setting.
Start with the purpose
The pump moves water through the filter and sanitation system. The goal is adequate circulation, not an arbitrary number.
Variable-speed pumps change the math
A variable-speed pump can run longer at lower speed. Heaters, cleaners and salt cells still need minimum flow.
Summer needs more support
Warm water, sun, storms and heavy use raise demand. Schedules or output may need seasonal changes.
Watch the result
Cloudiness, poor skimming, low salt production or recurring debris can indicate inadequate flow or another problem.
Use equipment guidance
Follow pump, filter, heater and sanitizer specifications. A technician can establish a practical schedule for the actual system.