I actually didn't know there was an 8 weeks rule.
Personally, I always delete the books from the list when I receive them because I know it is unlikely I will read them straight away and also, I may well pass them onto others so they never get swapped again. If I do decide to re-swap a book I prefer to list it from scratch, that way I can be sure the description is accurate.
Currently reading: The Woods by Harlan Coben
Wishlist TBR