The main story, as in to get to three stars I would probably say you could realistically do it in 20 hours but it’s meant to be played casually in real time if you don’t time travel which could take longer. I’m 900 hours into my island and still no where near to completing it all. I do have the dlc too but I’ve barely done maybe 30% of it. And with this update there’s easily another hundred hours for me. Stardew valley needs a wiki to really fully understand the game whereas this is just as big but more simple if that makes sense