I run my over 13.5 hrs. I leave early and get back late. I have a bunch of wrasses, and love to see the tank. Light start to turn on at 6 AM and completely off at 7:30PM. I have Radions and use the normal light, just intensity ramp up then down.
The fish and coral don't mind. I love to have a few hours of light to see and feed the fish before the tank goes dark.