MY DS was a rower and if they didn’t have have regattas on weekends, they practiced on Saturdays. I don’t think coming home on the weekend is going to work during rowing season. I don’t know much about riding but I’m sure most horse shows are on weekends. Both sports involve a lot of transporting of stuff to get to the weekend events so I’m sure they are all day or all weekend events. In rowing, we would get to the boathouse to load up the boats on the trailers at the crack of dawn, drive to the regatta, unload, row, wait for everyone to finish their events since they are usually spread out, reload the boats and meet the trailer at the boathouse to unload. It was easily a 12 hour day.