i put mine in the open so i get full sun all day. really depends on what time of year obviously the winter months get less light than the summer but in the summer my girls got around 13 hours a day of full force sunlight and then a few hours of dusk/dawn type light
alot of people grow in the woods and as long as its bright enough out long enough not to put into flower your fine, they dont need every min of sun per day.