To visit the canyon you have to book your tickets in advance online. You have to check in before you can start the tour, so best arrive at least 15 minutes early. The entry to the canyon is a bit further away, so everyone will form a convoy and drive slowly in their own car to the entry. Any normal car will handle the unpaved road, but it will get dirty ;)
You will have to leave any bags (also camera bags) in the car. I guess it's to preserve the walls from damages.
It is true that you don't have all the time in the world, but enough to enjoy and photograph the rock formations. To me it did not feel rushed. Our guide offered to take pictures of us and answered all our questions.