ok, i can't lie...I've past 30 min just over...I think it was 33 min .It's not so big deal but i hope you'll like it.. http://i51.photobucket.com/albums/f361/CaliRadu/Little.jpg

quick

hi, just discovered this thread...i like it, good work everyone!

heres my try...http://img379.imageshack.us/img379/6613/quickones016bq.jpg

Racing cars, @ 5 min drawing time each, done with markers,and pastels over a sketch, both pixs were done together at the same time, so maximum time was between 10-12 min...they were done as color studies for paintings;

Here is a 10 min sketch...of one car.
5 min (maybe,if that) to sketch and 5 min in Sketchbook to add shading and a touch of color.