the 2 fut. classes i was in( 72 and 71 entrys) lasted it seemed like about 30-45 min the ring. the fut judge picked out his selections from the whole class and then dismissed the rest of the class and then rejudged the final selections. i think the points are kept just on the top 10 he selects and are posted on the board later.
That particular driving class was broken down into 4 sections, with the judges picking 5-6 horses from each class to come back in for a final section, which was run as a "new" class. I believe it took about 3 hours total. My daughter was in the ring for 4 hours for her Halter Obstacle class-under on Sat morning. Youth weekend basically turned into an endurance marathon for the kids and their horses. There were little ones out there Friday and Sat until 2 am both nights, then turn around and be back in the ring at 8:30 am the next/same morning.