We selected the 6:30 PM slot. We arrived around 5:30 PM, and since it was still early, we ordered some drinks at Starbucks, which is next to Wildfire Pizzabar. Around 6:15 PM, we saw a huge crowd (a tourist group) already waiting in line, but we didn't join them and just followed the instructions sent via email. Our tour guide was already waiting, so we joined the line. We were a small group on the Dukling, roughly less than 15 tourists. We were offered a choice of water or soft drinks. The view was magnificent. It's better to bring a jacket as it is extremely cold and windy. My only suggestion is that they should have an official photographer for the Dukling while sailing the harbor, as sometimes high-end cellphone cameras don't quite do it justice.