The number of unused tickets that can be held with a single Expo ID is limited to the following:
・ Total number of tickets: Up to 100
・ Up to 50 Opening tickets and First-half period tickets
・ Season pass, Summer pass: Up to 14 tickets in total
・ Up to 100 One-day tickets, Special discount tickets, Weekday tickets, and Night tickets

https://ticket.expo2025.or.jp/en/faq/