How long are the items I selected for the WISHLIST are staying basket (without login)?

Wishlist data is stored with no expiration date.

For guest users (without login), wishlist items are saved in the browser's local storage on that specific device, so they will remain available even after the browser is closed and reopened.

However, the wishlist data will be removed if the user clears their browsing data, cookies, site data, or uses a different browser/device. Since the data is stored locally, it is not synchronized across multiple devices unless the customer is logged in and using a wishlist account feature.