It's a wonderful game, take your time to enjoy it. It's not going anywhere. In addition to the times listed above me, has the main story alone at an average of 38 hours, and completionist at an average of 60 hours, with playtimes up to 92 hours. (Mine is on the upper end, similar to OrbitalBeard but I think honestly even more hours, though the game keeps track of time when you pause so it's hard to say.) But yeah, even at 38 hours average for main story only, you'd be missing all of the fun sidequests, which doesn't sound like as good of a time to me personally. I recommend you plan for the long haul with this one, it's best enjoyed taking your time with it IMO. There's plenty to explore even in the more linear parts of the overworld.