I did a party one time where I made 10 pizzas in succession. While the 1st pie was the best, as the preheating conditions were optimal, pies 2-10 through 10 were pretty uniform as the conditions seemed to settle in. The bake time went up obviously, but the pizzas didnt' really seem to suffer. The fun of standing around the kitchen, talking, and eating pizza straight out of the oven made for a good time.
To try and let the stone reheat as much as I could, I didn't start shaping each pizza until the last one was out of the oven. I did the shaping, but the dressing of the skins was done by all the guests with whatever they wanted. We then launched the pie, ate the one that just came out of the oven, and waited for the next. It made for a somewhat long cooking endeavor, but again, fun times.