I use to hate that time of year too with the horses. My first horse took forever and a ton of work to get all the hair out. One summer when I was 15, I was in the hospital for quite a while with a serious brain concussion. When I came back, my friends had brushed my horse and gotten all that hair out for me as a thoughtful gesture. What a treat it was. He was one that would hold onto his hair for a long time. My Arabians weren't as much work and their hair shed out fast.
So have fun! I don't envy you that job. On the other hand, it does make for some really, really buff arm muscles. lol.