Shading is what takes me an hour lol...I can get everything else set up between 10-30 minutes and then have time to play with shading and trust me when I say do not smear your shading until you have it right because the oil put down by your skin will act as sort of a cover and when you try to erase you will only get a little bit, but most of the pencil will still be there and very noticable.