We did this post cruise tour in November 2022. There was a significant delay in disembarking the ship (which was obviously out of our control), and this led to decreased time at Kennedy Space Center. There were two buses. After receiving our entry tickets on the NCL bus, we bee-lined it to the bus that takes you on the Space Center tour as the lines can be long. In total they gave us only three hours there as we needed to leave at 1:00pm to make it to the airport by 1:45pm.
Due to the limited time, you will feel rushed. However, as the bus arrived around 9:30am, we were able to see what we wanted to see in the time given. (The shuttle simulator was a no go for us due to the long wait times.) There was plenty of time for us to get the feel for the place and even browse the gift shop prior to leaving. We found KSC exciting and plan to return on our own so we have more time to explore. As our flight home left at 5:30pm, this tour was ideal so that we didn't have to wait all day in the airport! You will not be disappointed.