Funny story, our company, for awhile used 8 hour rule. Captain BS'd the travel agent to putting him in business. F/A and I were booked economy, BA, JFK-LHR. Really not an issue, only 5+45 and I'm only 5'9". I just curl up with and wait it out. At the departure lounge, Cappy gets called to the podium and told Business is oversold and gets upgraded! DOH!
GF