So I decided to check the timestamps on my photos from last year:http://www.hieroglyphphotography.com/Bu ... urn-Night/
The crowd crush around the Man started at about 10:30, so that might be a good time for a walk back to camp. I could look up when the Burn started (about 9:30pm), but not sure that is relevant, since you are definitely staying to watch it.
If you are packed, you could be in the line for Exodus between 11:30 and midnight. Traffic while the Man is burning is non-existent, but builds to a 1-2 hours mob in the hour after Man-fall. And it will be a mob. The pulsing system for regulating outflow does not start until Sunday morning, about 8am I think.