Part Time Skimming?

[hillbillyreefer]

I put an old school Lee CCS in my fuge a couple days ago. The tank is in the bedroom and the airpump is annoying me at night. I was thinking about putting it on a timer so it only skims during the day. Will only skimming 14-16 hours per day cause any problems with the tank, will it be of any benefit? Does anyone know about how to set this thing for maximum benefits? I have no instructions.
The skimmate it produces at the moment is thin watery green tea looking stuff.

TIA
Brad