I'm a stingy SOB when it comes to utilities and don't want to pay the electric companies any more than necessary. I run mine as little as necessary and that may be a few hours a day as long as the pool stays clean. It (pool) doesn't get much use. My thoughts are to run the pump/filter as little as necessary to keep the pool clean. Each pool is different so you have to experiment as to how much time and when works for you. If you have solar heating then it changes the equation. Run for maximum heating.
Just my simple opinion.
Al