how long to run pump in cool weather after opening?

First I apologize if this isn't the correct place for this question. Feel free to move it to a more appropriate place.
My pool is open and chemicals are in good order. How long is it necessary to run the filter while it is still cool(H2O was 60 this morning) I was thinking 2 hours morning and evening until we start using it and the air and water are warmer. I do have a SWG. If I up the output would the 4 hours be pretty good right now? I would also rather use bleach right now to keep my Cl up instead of the SWG-just to save that ole electric bill. I also have a Dolphin for cleaning and would prefer to use that instead of the filter as much as possible.

Thanks.

In the winter, I run my pump just 2 hours a day and sometimes turn it off all together so I don't see any problem running it 4 hours a day. As long as it remains clear and you are generating enough CL, you should be ok.