PS: This whole thread reminded me of several managers I've worked with who were pathologically unable to estimate... anything, be it driving time or development effort.
They always focused on the "minimal aspect", ignoring everything before and after. Walking to the car park. Standing in line at the machine. Paying at the machine. Getting out of the car park in the car, surprisingly long during busy times. Driving through traffic. Any delays that could -- and regularly do -- occur. Finding parking. Actually parking. Walking from the car park. Etc.
