I board my horses. At my barn at home, there are about 14 stalls and horses come in during the day if they are to be ridden. Stalls get cleaned 2-4 times a day. You normally clean your own stall, but if you can't get out, it will be cleaned for you.
Here all the horses are out 24/7 and only stay in if there is a health issue. The horses that come in the stalls are usually greenies learning to accept being in a stall or boarder horses to eat their supplements. There are 7 stalls in the main barn. The stalls are thoroughly cleaned and re-bedded (if needed) once daily. The stalls are cleaned for you.
"He doth nothing but talk of his horses."