FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,066
Not only that... but the Marriott transfer to KE could also take a long time.
I suggest you look for award options where Amex converts directly and instantly to the airline.