Is there a maximum number of times I can amend the date time of my tickets on Booking-Portal? You can amend your tickets up to 3 times on Booking Portal. Related articles What is Booking Portal? Can I change my visit time or date after my original visit time or date via Booking Portal? Why do I need to book a time slot with my combination ticket? Can I amend my tickets to an earlier time or date on Booking Portal? I've booked the wrong tickets, what do I do?