Sub hour is very possible for this Chapter. Chapter 5 has the be the most fun chapter in this game to run. A lot of shooting unlike the other short chapters which have lots of slow walking. Also I grabbed the pump shotgun during the shootout on Fleeting Joy makes the cave shootout a lot easier.

Mod Edit: Retimed to 1:00:31. Make sure you end the timer when the subtitle text ‘Chapter 6 Beaver Hollow’ appears .

mod note: updated time because no the time begins after the first cutscene has been skipped and the text 'Welcome To The New World Appears'