According to the Chiltern Railways Passenger Charter, nobody should have to stand [on one of their trains] for more than 20 minutes.
I am currently sat on a train (which left Marylebone at 20.37) on which dozens and dozens of people are standing. The first stop is / was scheduled to be 25 minutes after leaving London Marylebone. We set off 30 minutes ago and have not yet reached that first stop.
I really do worry about what passengers are going to experience during the Olympics. The opening ceremony is two weeks tomorrow.
Oh, and it's still raining. Does anybody have a spare Ark?