Dr. McCoy portrait, part 2

It's amazing how, while I'm at the office, the hours and minutes drag by one by one by one....byyyyyy.....oooone. Then, when I get home, I sit down to draw and suddenly it's bedtime. It's sort of like how, when watching the sand go through an hourglass, at first the grains seem to slip through slowly. But then the last little bit of sand just drops through all at once. Do you know what I mean?