I have sold a few brands which had filter cycles. I found that running the minimum amount of time which yeild clear water seems to be the best route.
Also, running the filter each time you get out of the tub seems to have a big impact on this. If your spa has either an automated filter cycle after use, or a manual timer, run the filter cycle after each use. That will allow you to have a nice clean clear spa with less daily filter running.
8-)