So this is what I got from MMSR-4 (from the GySgt's mouth). Once they receive your findings from the PEB, they have a strict 24hr turnaround to certify your package. Certifying is basically them looking over the documents and inputting the data into the system. The system then automatically calculates a new EAS based on how much leave you have accrued, plus 20 days of PTAD. Your EAS will automatically post to MCTFS/3270 once certified (give it a couple hours). However, not everyone has 3270 access, so it will take up to 48hrs to populate on MOL (that is counting on that MOL is not down - keep an eye on the date last updated in the top right corner of your MOL screen).
^ an older post on this forum