Question abotu hay for horses?

Again, it depends where he is grazing during the day, my 16.3 thoroughbred grazes all day on a large paddock which he shares with three mares, all similar size, they have around 6 acres between the 4 of them and the gr is good, when he was in full time work (at rest at the moment) he grazed for around 8 hours, came in to rest for around an hour before work, this would be intense schooling or a long hack, he would then rest for a further half hour before having a tea made up of chaff, mix, sugar beet and conditioning cubes, he would then have a full hay net during the night whilst he was stabled, around 4 sections of ordinary hay, during the winter, he has breakfast also, made up with the same feed as his tea, im not sure if quarter horses are good weight carriers or not, (thoroughbreds arent) but I would be pretty sure that he needs a good diet with plenty of protein and conditioning products, ask your local feed supplier, they should be able to tell you what feed contains the right things that your horse will need, a hay bale for us costs around three pounds, this lasts my horse around three days, I would think it is similar price (in dollars though, lol) by you,hope this has helped xx