I did a semi-completionist run (without a guide) and it took me about 38h start to finish! I played it on my school/work commutes and sank some evenings into it, the game is pretty generous with save points.

If you have a Switch or a Steam deck, I would highly recommend getting it on there, the game really lends itself to portability and has natural stop points that reminds me of how DS/3DS games were structured back in the day