I try to keep mine living out 24/7 for as long as possible. My dressage horse is paddocked 24/7 at the moment, and looks a million bucks, lovely condition, coat is like satin and great muscle tone. However as we're coming into winter, I will be getting him clipped in a month and seeing as that's when the bad weathers starts coming in, I'll be stabling at night and putting him out during the day. Usually when stabling, I bring them in at dusk, and put them out at dawn to give maximum grazing time. On the REALLY horrendous days, when we get big storms, wind, driving rain etc come through, I leave him in all day but give plentiful meadow hay for them to munch on.