Sunday night I prep a week's worth of feed & supplements for each horse in Ziploc bags and fill all my slow feed hay nets. I'll have all week to buy more feed, if needed. I feed square bales and aim to never go below 2 weeks of quantity, just in case.
5am-ish daily: Turn hose on in water tub every morning, except Saturday when I scrub first. Dump Ziploc feed bag in each horse's bucket in the loafing shed, close gate to keep horses in sacrifice paddock which contains said loafing shed, pick manure out of loafing shed (no shavings/bedding, just sand, super easy,) fly spray each horse and give quick once over, turn on closed-motor fan in loafing shed, turn off hose, be back in house within 12 minutes to get ready for work. If I'm riding early to beat the heat, I'll let my horse nibble on hay while I groom & tack since he's been in the sacrifice paddock/dry lot overnight.
6pm-ish daily: Turn on hose if needed (it's been triple digits all week,) dump Ziploc feed bag in each horse's bucket, give quick once over, open gate to allow pasture access, pick manure out of loafing shed, turn off fan, turn off hose, be back in house in about 10 minutes, 20 if I need to dump the wheelbarrow of manure along the side fenceline where it composts down to practically nothing since there are no slow-to-breakdown shavings in it.
Weekends: pick manure out of sacrifice paddock, scrub feed buckets and water tubs, sweep barn, tack and feed rooms. Clean and re-fill water tubs in pasture (horses prefer the shaded tub by the loafing shed, but in this heat I offer multiple options.) Check barn, loafing shed and all exterior areas for wasp/hornet nests.
First of the month is fence check and de-cobwebbing the barn. If forecast calls for rain I'll drag the pastures so manure will dissolve. Mow as needed, always before weeds go to seed. Premise-Fly-Spray in the barn quarterly (bugs never die in Texas!) I don't bother rotating pastures anymore, and have seen no ill-effects on grass quality. Horses ARE locked in paddock anytime pasture is remotely wet, to protect the grass, though.
~Reserved Cash, 2011 AQHA gelding~
~Lark, 20-something Arabian mare~