Well, I did it last summer, took a couple of hours as there were a big group of Italians too. You have to fill out 2 declarations, keeping one. Be accurate about the amount of money, they can ask to see your money (did that to me). It was not difficulty to get through, just a lot of waitingtime. Go straight to the arrival section and find the declarationsforms to fill out. They have a russian side and an english side, but the text is the same and you have to write the same on both forms. Getting out quick and start filling out the forms might save you a considerable amount of time unless there is a big tourgroup as they apparently will take them first. 50 middleaged people on a tour takes a looong time to get through.