Dave,
There were 90 pilots to start with. Each flies their turn for the judges, usually figure 12 minutes (2 to start 10 for the round). It was almost impossible to get more than 1 flight per day, until the field started clearing out.
Tommy

The rounds started at 730 am but really did not get going until about 750. They broke for lunch at 12 for 1 hour and then went back at it again till about 7 pm, weather permitting.
There were 7 judges, 2 would cycle thru every hour so there was always 5 on the line.