I crossed 24K with a purchase that had a posting date of 12/21, but still have not received the 2nd 500 PQP.

For the 1st 500 PQP's (for passing 12K) it took 12-14 days for them to show in my account. However the 500 PQP transaction date was actually pre-dated to 4 days after I passed the 12K spend.