Oh, sure. But you have to accept that 12 hours is as much of a long play as 6 hours is a short one, and the actual playtime is somewhere in-between. But The Order does have an amount of core content, from that start to the credits, that can be completed by a player in 5 and a half hours in (seemingly) their first run. Whether that's likely is heavily debatable, as is whether that 6 hours of 'non-core' gameplay is meaningful to most players.
Actually this isn't true since most of the playthroughs so far are bunched around the ten hour mark. Five hours is an extreme outlier so far, more so than the 13 hour one.