No no, it takes them about a week to adjust their intake after offering hay all the time in slowfeeders. They're sort of programmed to eat fast and everything all at once. When they figure out the hay will not finish, they slow down. No need to shove it in in a hurry. So they eat, little mouthfuls at a time( small holes, 2", gives them a little only ), for about 20 minutes, then stop, do something different, then go back to the net. And so on.
I have 4 nets, with different hays, for two horses, they sample here, go there to sample that, then across the paddock to the next. Quite neat to watch actually. I fill all nets every day, mostly just topping off. They get ration balancer with some soaked alfalfa pellets and omega horseshine, divided in three meals. I have to bring it to them, they rarely come for it