My daughter (aka farmhand) is in H.S. - she has been doing all her own horse care, and most of mine, lol, it's trade for the fact that I foot all the horse bills, since we brought home her first horse when she was 12. When she gets up in the morning she takes her mare's grain out (we soak it overnight), puts her in the stall to keep my pig out of it and then comes in to get ready for school. We also set "dinner" to soak at this time. Before we leave, she goes out and turns her out.
When she gets home, she mucks out the stall (we use it as a run-in so both horses go in/out all day), rides, grooms or whatever she wants to do with them that day. When I get home I work with/groom whichever one she hasn't gotten to yet and/or we might go for a ride together, etc. Dinner is served when we're done with them for the evening (I said 6 in my response to your other thread on this topic, but it can vary quite a bit in the summer months when we have hours of daylight after work). With the round bales we are using now, we don't have to worry about putting out hay, but when we were using squares she/we would put out hay morning and evening for them.