Back when I played it I couldn't even beat it without a walkthrough (I was pretty young, one puzzle specifically which involved hearing a noise and figuring out that meant to ignore a symbol or w/e), but I think Neverhood was quite a bit longer, I still remember pretty much every puzzle, and I remember there being a decent amount more and more areas to explore
Also I suppose there's this: http://howlongtobeat.com/game.php?id=10109
Apparently around 9 hours for Neverhood