The second nine on all championship courses gets very slow/backed up if you play in the afternoon wave....because they let people out between 1:30 and 2:00 who want to play only nine holes.
So, the nine holers go out before the people who played at 11:56 make the turn. Adds more people to the course suddenly and many who play only nine holes tend to be a little slower than 18 hole players.
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