Did a B2B in March 2010 on the Triumph. Had the same cabin for both, was escourted off the ship by a purser at 09:00 through customs. Only needed to have in hand travel docs, passports or ID's, and customs declaration due to traveling a different itenarary. Had to wait with the oncoming passengers to re board. Was in the first group after the wedding parties and the assisted guest. Got back on board about 11:15, but we were able to go directly to our cabin as soon as we boarded. Per approval from our cabin steward. It was a lot of fun.