story around 20h, side content around maybe 40h.I did read most of the reviews in Spanish and most of them say they didn't complete all the secondary missions before writing the review.
Did any review mentioned to have completed all the secondary stuff? Did they mention how many hours takes to complete everything, not just the main story and a few side quests? Seems that there are many awesome secondary missions (Witcher 3 level) and it opens a lot of extra areas and content.