How long to run lights

I have a 180 gallon sw setup with mostly fish and inverts, but some coral. My question is, how long to run white lights and actinic lighting. Right now i run lights from noon til eight. Actinics come on an hour before and stay on an hour after regular lighting. Am i leaving lights on too long? Any input would be appreciated. I have a power compact setup with double 96 watt 10,000k white lights and double actinic.