Reliable source from shinobi602: "8-10 hours [normally], 10-12 if you like to take your time, take in the sights and a explore a bit. Difficulty will also change things around."
Stop posting baseless disinfo from lying and malicious fanboy waste like timdog and crapgamer. It's bad enough you flood the forum with copypasted trash from misterxmedia's blog.
Impressions of the Playstation Experience The Order demo were much better than the earlier 5 minute demo. Impressions from people who've played the final or near-final game are good so far, it plays a lot like Gears of War. Fanboys and no-name blogs are still clinging to those outdated old impressions out of blind hatred or clickbaiting.
Of course a Sony exclusive game being flooded with disinfo and FUD is normal.
Its not like Rollins posted that as Gospel, he provided the source and link.