you are right here,
whenever pump is wet or did not run dry it should be fine.
At 540 gallons per hour, it'll take approximately 9 hours to fill a 5,000-gallon pool with your half-inch hose. if you have a bigger hose, the time to fill your pool could be decreased.
for more than that:
https://www.polygroupstore.com/summer-escapes-pool-pump-s/297.htm