I think they are strict on the timing. We did it around 2pmish so that we could take our time about it and still be on time for our Ohana reservation. We opted to make this parting our resort day as well and it really made for a nice change of pace.
We did WinterSummerland and it was so cute! The course was not overly challenging so that we all could have fun. And the theming was just fantastic. It was also plenty well shaded there which was good in the hot Florida sun.
One thing I would HIGHLY recommend is using your own car if you have it or an Uber/Lyft to get to and from. We are big proponents of Disney transport but this was the one time we regretted using it. Because the buses don’t go directly there, it took FOREVER to get there and back.