When leaving RTB for your return trip, I'd get there at least 3 hours early. For reasons I can't make sense of, they have started a new departure security process in which they look at your passport, take your picture and take fingerprints BEFORE you get to the actual security checkpoint. 2 weeks ago it took almost 2 hours to get through the horrid process. We actually arrived in time to get through the mess and board on time, but we sat on the plane over an hour as it was over half empty due to people stuck in the mess.