If you can get the pump on a timer, just being able to run it for an hour, twice a day in recirculate mode, will help. With a cover, and this time of year, you shouldn't have to worry about evaporation dropping the water level and sucking air in the skimmer. I also say recirculate because you don't want the filter plugging. All you want to do is kick the water around. Of course having someone come in whenever possible and check the basic chemistry would be ideal.
Al