darkwoof: It took me 38 hours to finish it on normal, and I didn't even complete a number of side quests I picked up, let alone those that I didn't even get. I've also seen many people asking questions on parts I never saw, possibly branches I never got access to due to to choices made.
Play time differs from individuals to individuals; I'd say my timing comes pretty close to what they promised. I also ready consider myself slower, since I believe the 40 hours people claimed the developer has said probably refers to the main plotline, but includes the multiple branch lines the story can take.
Hawat: You only did the mainstory in those 38h ? because that is what they said for 40 hours.
Nope, I did mainly the main quest and took up some of the side quests, but did not finish a number of them. I'm usually the kind that will focus on side quests on subsequent run, but focus on the main during the first run cos I'm impatient getting to the end of the story.
I'm estimating that if I only do the main plot I'll run roughly about 25 hours or so. Since I'm only doing one of the main branch according to the game guide, taking both branches into consideration (from the game guide it seems like both will lead to quite different situations) I think it'd yield pretty close to the 40hr mark.
In comparison Steam says I played 47hrs on Witcher 1, and that's including completion of some of the mods included and a partial replay of the original campaign.