I tend to have from 1 to 5.
I don't feed round bales as they are a pain to handle , and seem to get moldy before they get around to eating it all. Currently I have plenty of green grass left so they arnt eating much hay, honestly I have no idea how much I put out. I don't track it. I put hay in the feeder when it is gone I put in more. When the barn is about half empty I go buy some. I have much better things to do with my life than weigh hay. I figure the horses know what, an how much they want.
Sorry if me thinking a horse should have food to graze on all day is offensive to the "that's the way we've always done it crowd".
This year was really good. I had so much grass I was mowing the pasture. Last summer I started feeding hay in July because it was so dry. So I guess to answer you all I can say is I don't have any idea. The hay I feed is going to depend on the weather and how many horses I have here. I shop around for hay and get hay that they will generally eat all of and not leave alot on the ground. I have a couple local growers I am happy with.
I also never said anything about giving free choice Alfalfa, I said they get free choice simple grass hay, and feed and alfafa is used to adjust for weight and workloads. Giving free choice alfalfa and free choice to super manicured overly managed pastures is what leads to problems. Not lots of plain timothy or K 31 hay.