The most efficient speed for the EcoStar is around 1000 RPM. So if you can get away with running the pump at that speed, then that is your best option. However, you may find that the skimmers don't work so well and if you have a cleaner, it too may not work at that speed. Then you may need to run at slightly higher speeds. Some trial and error may be necessary to get to the optimum speed.

As for run time, the short answer is for as long as it takes and I am being serious. If you find the speed where the skimmers seem to work well, then run the pump for as long as it takes to keep the surface as clean as you want.

Really, there is no set rule for how long to run a pump. As long as you get enough chlorine in the pool, that alone should be enough to keep the pool algae free. The extra run time is just to keep debris out of the pool and that is personal preference driven.