I would not try that....
Let's say you arrive at 5:20p... you get checked in at 5:30p.... An hour for your meal 6:30p. Now you have 35 minutes....
Then you'll get on the elevator.... head down..... walk to MK. Bags checked. Wait in line... Walk in.
Walk through Main Street, veer right and head to Tomorrowland Terrace....
So it's subjective... If there are 2 of you and you are physically fit.. .and adults and know where you'll be going you will be fine...(but you'll probably be TOO Full to enjoy the desserts)
If you have kids in tow.... strollers... and any questions about locations... you'll be in a tizzy... don't do that to yourselves on Vacation..!
have a magical visit !
Mary