I just had a waitlisted GPU clear on a EWR-TLV flight at beginning of Feb. Hadn't checked R space for the past few days so I don't know how long it's been showing R>0, if at all. But the upgrade cleared (J is wide open). I understand that this is not a useful data point since I have no idea how long R was open before the upgrade actually cleared, but it's proof, at least, that upgrades can sometimes clear off the waitlist....