Hi Sailor, when I switched to free choice my horse was very inconsistent at first. (Thanks to everyone for helping me find where to start!)
For the fist few days my horse ate a lot of hay until she learned that it would always be there for her. Now she has a pile in her stall/pasture and she just takes a bite every few minutes. She is a small horse so she eats about half of a bale every day.
I would give you some advice but I'm still learning too.