It depends completely on which attractions you choose (will your DS want to go on the Mountains or stick with the tamer rides?) and what time of year your trip is planned. The carousel will only take you a few minutes, while Mickey's Philharmagic will be a much greater investment in time. Also, with a 5yo on board, you can (and probably should) be easily sidetracked by all the Magic MK has to offer. This is how we always toured with a little one in tow: My DD was interested in completely different things each trip - sometimes the focus was pin trading, sometimes it was characters, sometimes it was rides. We always had a deal with DD that we would skip the characters and pin trading at the beginning of the day. We would take that first hour or two and conquer all of the attractions that tended to be busiest later on (particularly Fantasyland and Tomorrowland); pretty much commando. Along the way, we would grab a fastpass for something we didn't hit (usually one of the mountains). We skipped attractions that were easy to get into later in the day (the Carousel, Mickey's Philharmagic, and the Play areas for example) even if we were "right there". Once we got all the biggies out of the way, then we would kick back and play. By this time DD would have figured out what she wanted to do next (pins, characters, snack etc) and she would direct the rest of the morning. It was much easier for us to relax, because we knew we weren't blowing prime ride time on pin trading, or whatever and we knew we were going to be ahead of the general crowds. So my now long answer to your short question would be: Figure out what you really want to make sure you hit, pick out the attractions that will be busy later, focus on those and get them done first. Then it won't matter how many attractions you get done, because you've finished all your "must do's". No matter how YOU choose to attack the attractions, absolutely, positively make sure that you make time to just enjoy being in the park together. Those moments will end up being what you and your DS remember years later.