Sea Time to Upgrade to Chief Unlimited


In upgrading from 1st a/e to Chief Unlimited, 240 12 hour days as a 1st a/e is needed OR 240 days of which a minimum of that must be 120 days as 1st a/e and the remainder must be as a/e on a 2 for 1 basis. My question is, can any of the sea time on the 2 for 1 basis be in the position as Chief Engineer? When I got my 1st a/e, and even though I held a 2nd a/e, all my sea time was as Chief Engineer.