I personally don't know how the end of chapter 2 and the chapter 3 will turn out.
But, given the amout of time we are putting into adding content, it would be a waste to 'force' players rushing the game and thus, missing said content.
I'm not in Altos' mind but I'm confident that, if an actual time limit is set at some point, it would be for very specific quests/tasks and the players would be advised before proceeding if it closes some path and/or major events (so they can complete the remaining content before moving on).