Hi Julie,
Thank you so much for visiting the Disney Parks Moms Panel with your question. How nice to be taking a long and relaxing vacation to Walt Disney World. Disney's Saratoga Springs Resort & Spa will be a great home base for a long vacation.
I am assuming that you have purchased the
21-Day Ultimate Ticket, which is a ticket available exclusively to guests from the United Kingdom. I checked with my wonderful fellow Disney Park Moms Panelist Jane, who lives in the United Kingdom, and she explained to me that these tickets are activated on the first day of use and expire 21 days later. Since you are checking in on August 9 and checking out on August 30, you actually have 22 days that you will be at Walt Disney World. Therefore, you need to decide if you want to have your tickets' first day of use as August 9, in which case the last day of use would be August 29, or if you would rather start the tickets on August 10, in which case you could use them on August 30. I suggest that you take a look at your travel schedule and decide which day you would be able to spend more time in the theme park. You could also consider if you would like some extra time on your check-in day to settle in and explore the resort, or some extra time on your last day to pack and prepare for the journey home.
I hope that this information is helpful for you, Julie. Have a wonderful time planning your magical vacation, and please do not hesitate to ask if you have any further questions.