My horses are drylotted all winter because the stock tanks are near the barn and it's easier to plug the stock tank heaters in without running cords out to the pasture.
We have three small pastures for the minis and two big pasture for our two big horses. Before we turn anyone out into the pastures we take a cutting of hay off it, so generally no one gets on pasture until mid-June, except for the big horses who are put into the pasture we don't make hay off.
However, we'll halter all the minis every day starting around May 1 and walk them into the pasture for ten minutes of grazing before we bring them in for the night.
In the summer, they are brought into their stalls at 7 PM and at 7 AM they get their morning supplements and are turned out into pasture for four hours. They are brought back into dry lot until they are put up in their stalls at 7 PM, but they do get some hay at 2 pm in the drylot. I never leave them in the pasture past 12 noon, as the fructose levels in the grass start rising then, and fructose is a contributing factor to laminitis. They are also fed around 1.5 pounds of hay at night. Usually by morning there's still a bit of hay here and there in their stalls, but not much.
I used to worry that 12 hours was a long time to go without hay, but I figure that when they are fed at night they aren't eating every bit of it at once, so it's maybe more like 9 or 10 hours they go without hay. This does concern me but it's just not practical to give them hay any later in the evening, as our barn is so far from our house that we have to drive the four wheeler to it, and in the winter that's pretty cold at 10 PM! In the winter, of course, we increase their hay intake at night quite a bit.