I don't believe this story. Oh I'm sure there's a kernel of truth in there, but I think it's mostly made up.
It was more like 3 weeks in my case probably (and after that consistent mind numbing 50 hour weeks). And during my short time in consulting I never met anyone else who was "on the bench" longer than maybe 3-4 weeks or so.
So yeah, I'd say the story is either exaggerated or an anomaly.