I work at a 20-something-stall barn where I muck four stalls. The turnout is very poor (half the size of a postage stamp, zero forage- not even weeds-, pretty muddy, bad fencing) so the horses go out about once a day for 30 minutes, maybe an hour, to get some energy out and to get some air. That means my four stalls are dirtied up for about 22 hours a day (including riding time). So, it takes about 20-30 minutes for me to do one stall, longer if it's a Monday, because I get Sunday off.
Okay, so about awesome owners: the owner of one of the horses whose stall I muck had done the stall for me! On a Monday!! All I had to do was pick up some of what she missed in the corners and I put in two loads of sawdust as a thanks. She, apparently, had the day off or something because she had just seen the stall dirty and decided to clean it up for the heck of it. Then she rode, hand-grazed for an hour (!!), and groomed her horse (a very pretty but old bright-red chestnut gelding with a wide blaze). I hardly ever see owners doing things like that; most of the boarders are teenagers or mother/young daughter pairs with which it's really only the daughter who is there.
It's so refreshing to see someone care for their horse (riding and buying new tack do not count as care in my book) and go out of their way to do things for the horse and for other people. Happy rant over.