Great sketch of what is not an easy subject!
You've got me thinking say you study the object for 5 minutes then draw it for one minute, what then? I've really been thinking about the way we observe our subjects before the pen hits the paper. Your drawing reminds me of an elephant trunk with all the details.
Great sketch. It is so easy to get caught up in the detail and spend too much much time. I like the idea of putting a time limit on!