As much as you want. If you're asking this question, you're not a survival game type-of-player.
You can beat the first 2 bosses almost right away, but when playing with friends, I can spend more than a month just to build a solid base (full on village) & outposts before even killing bosses above that. If you're not into building & crafting, I don't even get how someone can play this game more than a week.

The ''how long does it take'' question is relevant for games like Assassin Creeds and such, not a survival smh