charleswang95: How long will I beat the game (include all the side quests and main quests in act 3) with roach's path?
Depends on how you play. I went through and did everything I could and it took a few hours, though I could see it taking some people more time and others less.
For a point of reference, it felt like it was about half as long as Chapter 2. Granted, a "feeling" isn't very scientific, but it'll have to suffice since there's really no real way to measure the length. If you go in expecting it to be super short, you'll likely be surprised, but if you expect it to be the length of other chapters you'll wind up disappointed.