I turn my attnics on at noon. Main on at 1. Main off at 9. Attnics off at 10:30. Basically 8-10 hours is good. And just set the lights to whatever time you happen to wake up so you can enjoy the tank more.
If it's for the 125 you have about 4x light. Which is very good. Softies will grow like wildfire. You could even put some acropa near the very top. Even hardies like hammers, bubble, and fungia could probably florish if you ever decide to add a couple (and trust me, you will).