Yeah, basically you have 1 hour to play if people are waiting. People sometimes exceed that though, and it's incredibly annoying....I'm not exactly proud of this ( ), but one time I was waiting for almost 2 hours for a court, and this group of like 6 teenage kids were using the court (3 ON A SIDE!!! ). I calmly informed them that there's a 1 hour time limit, which they basically ignored.
10 minutes later I drove by very slowly and threw 6 or so eggs over the fence at them and told them to, and I quote, 'Stay the f**k off my court'.
So yeah to answer your questions, some problems do arise.