Looking back at the last reexam 90/008237 there was more than one entry for litigation search (and many entries for IDS):

6/13/08 litigation search

7/2/08 non final action

3/2/09 litigation search

3/17/09 final rejection

5/12/09 response to final rejection

9/11/09 Notice of intent to issue a reexam cert

If the above timeline is any indication of what we can expect, then my best guess is two weeks from the date of litigation search to office action. Corrections, comments welcome.