Posting in one area is usually sufficient...copy, paste...
How long is the sun up? I time my lights based on how long the sun is up. Since most of my tanks are not in direct view of the windows, I base that time period on my schedule. I have my lights on for about 10 hours (little less than daylight hours to prevent algae) and I come on at about 11AM-9PM so that I can get the most out of the tank. That also allows the tank lights to go off before the room lights for a less stressful change.