How long do you have to claim web event rewards after launch?

The clock starts at official launch, not at the event. The Time to Aniimo web event ran from August 26 to September 3, 2026 (UTC+8), and anything you picked up in that window just sits there until the game opens. Only then does the 180 days begin running.

The action that ends the countdown is making a character. Logging back into the official website does not do it, and neither does owning the account that earned the rewards. You have to be in the game with a character created, and you have to do it inside the window. Miss it and the whole haul goes, not just part of it.

What that haul contains depends on how you played the event. The daily allowance handed out three random Aniimo eggs to hatch and reset once per day, so people who logged in every day of the run have considerably more waiting than people who dropped in once. Hatching those eggs could produce duplicate drops and shiny variants. There is also the Aniimo you selected to twine with, and the Meet an Idol profile card background if you collected all five featured basic Aniimo. All of it is on the same deadline.

If you played the closed beta

Beta creatures come across by a different route. Secured creatures transfer to the global launch inside a sealed promise egg, and that egg is claimed through the official event page using your beta account rather than through the in-game reward flow. Keep track of which account was your beta account, because that is what the page checks against.

Not settled: The window is anchored to official launch rather than to the event dates, so the exact calendar day it closes depends on when the game launched.