If you are not the sort of person to look up youtubes and guides you could spend hundreds of hours on your first world. And that is without a lot of loafing.

One of the benefits of RNG map generation is that each world is different. Even similar biomes will have drastically different resources depending on its layout.

If you look up walk through guides/vids you can rush it in maybe 30ish hours? Less if you use cheats.

Game has a lot to offer... I often think the people who complain about lack of content only played one world.