We probably want to see a bump NW on the 00z suite to keep this one alive...or at the very minimum hold serve and then a bump NW at 06z or 12z.
On our threats that came back within 60 hours, usually we started seeing a move by 48...I'm thinking of systems like 2/5/16 or even 12/29/12 (aka "the rpm storm")...we started seeing a creep back NW around 48h out even if it wasn't a hit yet.