A ad for the movie 127 Hours just ran on the television. I was aware that a movie had been made of the subject but I was unaware of the title. I have heard of the title on a few occasions and, based on the title alone, I was not all that interested. Listening to that ad just now, I think I figured out why.
127 Hours sounds like a long, long movie in a way that 48 Hours, 28 Days and Nine Months do not. Maybe because when I hear 48 hours I immediately translate that into two days.
No major release movie is going to be of a length measured in days or months. But movies measured in hours are routine. 127 hours is too many.