A few hours, at least three I'd guess, probably somewhat more. That said I don't play this kind of games regularly and I'm a somewhat conservative player. I think I went off track with the main story line when I found killing that initial insect creature (utrapi?) too hard. The combination of controls which made me do the wrong moves when things got heated and the fact that you need to learn to move backwards and time your attacks as you seem to get stunned for a brief period every time you get hit got me killed a few times. So I decided to just go explore and ended up visiting the three towns and getting as many quest as possible. My first kills were three snakes and after that I did the wine retrieval quest. It's been easier since.
I like how "complete" the game feels with a full skill tree, mini-map and map, alchemy, and lots of neat touches like the birds flying, leaves falling, book pages turning, and the characters "talking". I also like that the battles are fairly quick and that the game eschews any requirement to eat and drink which means that I don't feel stressed when I'm just wandering around exploring and looking at stuff. The sound and music deserve to be mentioned as well, I like them quite a bit. The biggest thing separating this from a fully professional product is that the models and texture are a bit hit-and-miss and not everything fits together in the way it does when you've got several full-time graphics artists producing and touching up everything. And I'm guessing the amount and depth of the content but I lack the experience of similar games to fully assess those. But complaining about that would be completely unfair for a hobby project given away for free, I thinks it's pretty grand and I fully intend to find out what happened to the guys father!