Each time I have encountered these kinds of statements in the past, only about 10% of the time are they really true.
It is likely to be about 40hrs-ish for the core story, with about an extra 20-40hrs with side quests and the like.
Speaking to a friend earlier today about this and he mentioned Bioware do not make long games anymore - and I have to agree. They usually end up being about 40hrs.
