Yep, 13 is definitely doable, as lostprincess says, we've averaged around 11-12 at midweek parties. We watch fireworks, parades and shows but don't get in lines for the speciality snacks, characters or photo ops. We collect the treats but later in the night when the lines are shorter and only then, when we pass by. We've also taken time out to eat a meal. My tip is enter the park as soon as you're able. We usually do just after the allowed times that we've not in line for long outside. At this time there's usually a good flow of day guests leaving to park hop so that even before the tart time the lines are getting shorter. We usually eat before the start time and then head over to pick up our T or T bags. By 8 ish we've usually hit 3 or 4 rides. Make sure you pick up a show times leaflet and work around the shows, parade and fireworks for the rest of the night.