This doesn’t work for every horse.
My horses are out in pasture 24/7 and get grain in the evenings.
They get worked when I have time, usually 2-3 times a week for 15-30 minutes on the ground and if we are riding it’s an hour.
It’s also a good thing to mix things up, otherwise horses can get attitude problems when it’s feeding time and they are stuck working when they should be eating.
"Take the time it takes, so that it takes less time."
"Expect a lot, accept a little, reward often."