How many bales does one horse eat?

Like has been said, it will depend on many things. Not only the horse or what else the horse is eating (pasture and feed). Another thing to consider is the quality of the hay. The better quality should last longer. A lower quality will have more waste. It will also depend on how you feed the hay. Are you feeding the hay in a feeder or just on the ground. You will hav more waste without a feeder, which means you'll go thru more hay.

General rule is a horse will eat 1 to 2% of their body weight. A horse that weighs 1000 lbs would eat 20 lbs of hay. Hay bales will vary in weight. Figuring one weighs 50 lbs, it would be safe to say a horse would eat 1/2 bale a day or 15/month. It is better to estimate high instead of the minimum and running short.
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It depends on the horse! Their gender shouldn't determine how much they get. Each bale is a different size. Some are 50lbs, some 75lbs and others 100lbs. They even have round bales and large square bales from anywhere from 200lbs-1,000's of lbs. It really depends.

I've got two horses right now and they both manage to share three 100lb bales in a week. Everyday they each get 20# (My gelding needs to cut back to 17#) of hay. This generally costs me $160 strictly for feed.

Mine (17hh stocky build) eats 1/3 bale per sitting.. so close to half a bale (medium rectangle pre-flaked) a day of hay.

Well I have three horses, 2 hard keeping thoroughbreds and 1 easy keeping walker. I go throught 1 60-70lb bale of grass hay and 12 lbs of alfalfa per day(each TB gets 6lbs of alfalfa a day)