How many hours per day should pool filter run?

We have an older 18' by 33' by 52" inch above ground pool...which is approximately 15000 gallons. We are going to install a pump timer so we can control the number of hours the pump runs. However, we were curious how many hours a day we should run the pump on this large pool. We want to keep the... show more We have an older 18' by 33' by 52" inch above ground pool...which is approximately 15000 gallons. We are going to install a pump timer so we can control the number of hours the pump runs.

However, we were curious how many hours a day we should run the pump on this large pool. We want to keep the pool clean. But, we do not want to have a huge electric bill.

Thank you.
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