Wow all the possible answers! But from my experiences:
Scenario 1 (now, my own farm) Florida:
20 minutes AM, 30 minutes if have to take sheets/blankets off
…AM includes bringing one horse inside to stall, feeding her in stall, feeding six horses outside in fields, filling waters
30 minutes PM, 40 minutes if have to put blankets on
…PM includes putting mare back outside, feeding all seven outside, filling waters, cleaning one stall, sweeping
AM by myself (1 person). PM usually my boyfriend helps (2 people).
Seven horses - six are pasture boarded, one stall boarded who is out at night and inside during the day and her stall gets cleaned after she goes out at night.
Scenario 2 (worked at in past) Ohio:
45 minutes AM
…AM summer included cleaning 14 stalls, bringing in 14 horses from outside to put back in stalls, feeding, sweeping, filling waters
…AM winter included feeding 14 horses, turning out, cleaning 14 stalls, throwing hay outside, sweeping, filling waters
(did not work evenings)
One person, 14 horses
Scenario 3 (worked at in past) Ohio:
1 hour AM
…included bringing in and turning out various sets of horses, cleaning stalls, feeding, throwing hay outside, raking dirt floor aisle, filling waters, changing blankets in winter as needed
Two or three people usually, 24 horses
(did not work evenings)
Scenario 4 (worked at in past) Ohio:
3+ hours AM
…included feeding 30 horses, turning out some, cleaning 26 stalls, sweeping, filling waters
Two people, 30 horses
This place was the absolute WORST set up ever, which is why it took so long. Had a teeny tiny spreader that you had to dump at LEAST three times each shift because it was too small for the number of horses, and it didn’t help that they did not turn out very much so you were cleaning horrendous stalls every day.