
I regularly enter up to 3 classes with my pups, but I am in a numerically small breed and the puppy classes rarely have more than 3 to 6 exhibits, so the pup barely gets the idea before it is all over, so I prefer to enter two bred classes.
In the second all you will be doing is standing waiting for the class to finish and then setting your dog back into a stand with the others, and perhaps be asked to move once more.
Now the stakes class for me is the one that teaches the dog about being in the ring. Both you and the dog can learn to relax before and after being seen individually, then get into position when the judge is doing the first/final look see etc.
The stakes is a great for getting the dog used to a Group situation, should you be lucky enough to win through, as so often dogs don't compete in the ring with anything but their own breed.
Beng at the show is what is tiring, not a bit of standign aroudn and a couple of laps aroudn a ring, not likely to be more than 6 circuits with three classes.