Rachel,
Great question!
While you never want to rush a special meal, like dining with the Princesses at
Cinderella's Royal Table, I do think you have left enough time between the two appointments to get from one to the other in time while still enjoying yourselves. The fact they are right there next to each other certainly helps!
Make absolutely sure that you arrive for your 8:25 am meal reservation at least 15 minutes before hand. This will keep you on track to get done in time without having to rush. Your overall experience is not just eating. You have a meet-and-greet before being seated at your table, and once at your seats you will want to stay long enough for the procession of princesses to have visited your table. So while you should be fine with the 1 1/2 hours of your experience, there is a lot for you to do before heading off to
Bibbidi Bobbidi Boutique.
Finally, while you will have had two very special, and fun experiences by the time you are done at the Boutique, remember what happens afterwards! Make sure you spend as much time in Fantasyland, and the park, so that the kids can enjoy being princesses for the day!
Have a Magical Vacation!