Just got off the phone with my PEBLO. She said that from the day of accepting findings, the PEB has 21 business days to get it to HQ (MMSR-4). If after 21 business days and nothing has moved, your PEBLO is able to call and ask questions about what is taking so long.
When it's finally sent to HQ, it's given an index number that our PEBLO can give us. With that index number you can call MMSR-4 and give it to them for reference to your case. But once they receive everything it should be fast. From what I've read, MMSR-4 has a 24hr deadline to certify your package and input the new EAS into the system. Then MOL can take 48hrs to reflect the new date.
Hope this helps, because it eased my mind a little bit.