This situation worsens with time. I sold an item over an hour ago and the sales tab has still not updated. Paypal notification was an hour ago or more.
I have had this same situation with listings that I end on ebay and need to delete from closed listings (so that I don't erroneously relist). It is taking hours to see it appear in auctiva.
While I realize it may require more resources to synch more frequently, I am quite sure it can be done.
The delays grow and it is very inconvenient.