I don't know if there is a limit. I have used 4 cards. I had one main card I used, one time my card wasn't handy so the photographer gave me another one, I got another one at the water park that stays around your wrist, and I added my sister-in-law's card to our account since it was all the same family.
There are people who share Photopass cards on DIS to get the CD cheaper and I have seen up to 10 people doing that, so I don't think there really is a limit.
If there is a limit, we haven't hit it yet. Last trip we had 16 different cards-mostly due to the ones we accumulated at the waterparks where they handed you a new photopass bracelet each time they took a pic.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.