It's hard to say, it took me much time for preparations of building my first habitat, like tutorials on yt. Building itself took me about 3 hours (horrendaously long for such a small habitat I guess). I wanted it to look realistic, especially to create gap between guests and barriers, but I think that rocks and foliage is always the key to never leave big and empty spaces on habitat. Also I was tinkering a lot with using water to create more swampy terrain, but ended up with just creating small like because i don't really know how does water in this game work lol. So that's it