Interesting. Never heard of that before.
Second to Second: You shoot stuff all the time. Every x meters is some random camp that is occupied by NPCs of some faction. What faction doesn't matter anything (I don't see any difference in them as well), as everyone is hostile to you... Which means, yeah, you shoot stuff all the time. Nothing else to do, except that and looking at the enviroment visuals. Firefights can be fun, but it repeats and repeats... Always the same enemies, always the same tactics, etc. Get's old and boring fast.
Minute to Minute: Walking or driving around. Most of the time you do this to reach a job giver or the job target. If you like driving, this is actually fun. Walking on the other hand is tedious, as you are slow and walkways are reeeaaalllyy long (and in most of the gameworld, you have to follow the dungeon-esque forest / mountainwall buildup).
Hour to Hour: You do boring fetch quests. I've played 7 hours now and so far I have done nothing else. I can't even see the difference between main quests and side quests... Don't know if there is any at all.