So, this is a lower crowd time, I believe. If you high-tail it out of the arena, you will probably make it. I might leave before the whole show is over, but that's just me. If you wait for the show to be over, know that the whole crowd will be headed for the buses or parking lot. But remember that you're going from almost one end of WDW to the other. Depending on traffic, being out in front of the stampede from the arena.... I'm sticking with that you'll probably be fine. No other night that would work? No matter what you decide, you're going to be at WDW, so it's going to be great! Have a terrific trip!