Google advises keeping redirects after a site move for as long as possible, generally at least one year, and says that from a user's point of view you could keep them indefinitely.
https://developers.google.com/search/docs/crawling-indexing/site-move-with-url-changesThe full answer on site migration and avoiding traffic loss is on the blog:
https://aiwebpageseo.com/blog/what-does-site-migration-meanHow long have you kept redirects running after a migration, and did removing them ever cause problems?
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