Well, if there are no icons, I'm out.
If it is a 15 minute flight to get to action, I'm out.
If it is empty, I'm out.
Enemy icons are set to 1000.
It’s a couple minute flight to the action.
It’s yet to be empty at start time. Usually, there are several players already in a half hour early.
Give it a try. You’ll at least get a good work out. There have been nights with 20 or more in the arena.