I ask as I posted a book showing six members wishing - it has been just over 48 hrs since the second person was notified (as per the PBS "clock"), but the book hasn't clicked over to the third person yet.

I would wait one more day (meaning by tomorrow) and see what happens.  If it still has not gone to the third person, I would seek help with the PBS team. 

I believe it is just over 48 hours.  Requests time out in the middle of the night, but I think offers roll over within an hour or so the 48 hour mark.

Wish list offers are rolled over on the hour. If you posted your book at 2:15, then the wisher gets until 3:00, so 48 hours 45 minutes. If you posted it at 2:59, the wisher gets until 3:00, so 48 hours 1 minute.

Thanks, Cathy - that makes perfect sense in this situation!

I very rarely run across timed-out books at all, so sorry if I seem a bit hyper.