Hi Viv, welcome to planDisney!
I have great news, you can reschedule your
theme park reservations as many times as you want until your
theme park tickets expire! To check your ticket's expiration date, just open up your
Disneyland Mobile App, click the three horizontal lines in the bottom right-hand corner and select "Tickets and Passes". You should see your tickets along with their expiration dates.
Now in the worst case scenario that your tickets happen to expire, you still have options! Per
Disney's eTicket Terms & Conditions, any wholly unused, expired Disneyland Resort theme park tickets (except for special event tickets or tickets purchased from a third party), can be applied towards the purchase of a new theme park ticket in equal or greater value to what was paid for the original ticket. Good news right?
If you have any other questions at all, we're here to help!
See ya real soon!
Jin