Time

In Firewatch, Time progresses according to the narrative. Some things will happen obviously at certain times of the day, yet the time will progress. The time doesn't move according to real life.

Summary
The game gives options for player choice creates the responsive world, and while there are various different opportunities, there aren't branches of trees that allow different endings or discovering a failed attempt at discovering the mystery.

How Henry chooses to react to Delilah and things in the world, are constant and will enhance the game.