If ur asking if u can get thru a meal at CP buffet in 30 minutes ( meaning After youre seated) Yup.
There is some good food here, including carved meats, cold shrimp, salads, hot/cold sides and much more. Plus nice desserts.
It's basically your choice to either rush some food in or make it a relaxing slower meal, esp if you have no character interest.
Ate there last visit. We waited Atleast 20 minutes Past our ADR time, which I find is not Untypical.
Have a great visit, enjoy the food and the parade!!