See, if you ask someone what they expect in the normal case, they visualize what looks like the line of maximum probability at each step along the way - namely, everything going according to plan, without any mistakes or surprises. But actually, since more than half the students didn't finish by the time they were 99% sure they'd be done, reality usually delivers results a little worse than the 'worst-case scenario'. It's called the planning fallacy, and the best way to fix it is to ask how long things took the last time you tried them. That's called using the outside view instead of the inside view. But when you're doing something new and