Hi -- we are going to be in Rome in late June. I'm hoping to prebook tickets to the Vatican for our family of 4. I have heard some people suggesting that one visit the Vatican in the afternoon, as it may be less crowded -- does this refer to the line to get in or the crowds within the museums themselves? I realize that one can spend an unlimited amount of time viewing the collections, but I think we are likely to max out after 4 hours. If so, would visiting from 2 to 6 on a Tuesday in late June be any different (with respect to crowds inside) from visiting from 9:30 to 1:30?