User blog comment:MarkvA/Gamescom - Assassin's Creed III Preview/@comment-3202167-20120816114503/@comment-3202167-20120816142319

That is a speed run. First time no speed run, it will probably take you MUCH more than that. AC:R, the first time and I beat it in 9 hours. It was something like 9 hours and 7 minutes.

And AC1 has no side missions ;P And no, I left all the side missions in ACII till post-story. And AC1/II were long.