The horses I work with stay inside at night. They are turned out after breakfast, and a few come back in for lunch, the rest stay out. Then the inside ones go right back out. They then come back in for dinner at about 8. That's if they don't have class.
One horse does tend to stay in more because his owner doesn't want his shoes removed, and he's injured a horse. So he gets less turn out due to this. He's not even showing, and its not corrective, I don't understand why he has on shoes on all four.
My horse comes in at feed time, then often times he will go back once all the horses are out and check out everyones feed dish to see if he can get a little more. The only other time he comes in is if the weather is extremely bad....it has to be raining buckets though.
If ones injured I may put it in the barn, sometimes if I'm going to a show really early I'll put one in late the night before. Other then that never, I have a 21 year old mare that I don't think has ever been in a stall just never had a reason to put her in one.
My horse spends little time in the barn. All the horses at my stable live in the pasture 24/7. She comes into the barn twice a day for feeding, and then whenever I'm there to bring her in and tack-up/brush.
I grew up with daytime turnout in the winter and evening turnout in the summer. Now my horses just come and go into their open barn whenever they wish. Saves turnout time and stall cleaning time - time well needed:)