Based on info I got here I run my pump in two 2 1/2 hour periods -- have been doing this for months and the water is crystal clear.

It all depends on the size of your pump and the pool -- I have a huge one (2 1/2 hp) and so it will turn the water over even in our large IG pool very quickly. If you know the GPM of your pump and the size of your pool you can figure this out yourself.