OK, the amount of content in this game is insane! I am at 93 hours of playtime, and I would not be surprised if this went to Witcher 3 levels of 135-140 hours before I finished.
If you actually scan things and go and talk to people, you will get more than your fair share of side quests. Some will end up being intertwined with a main quest mission, and many will end up getting you really close to world viability before you even start colonizing a planet.
This is really, really fun! Also it is well worth $59.99.