I did this during the final few months of my A-Levels.
It was a Friday during March 2002, we were pretty bored as several lessons had been cancelled on a day when we had few anyway. So, at 8:30 I decided to do a bit of drawing practice in the library, inspiration coming from the Corgi models in that years Friends of RIAT catalogue. I had one hour break for a maths lesson, mid-morning break, lunchtime and afternoon registration.
Finished the drawing half-way through the last lesson of the day, which was Physics.
Regards,
Dan