That depends on the size and, even more so, the complexity of the piece. Total work time for this piece was probably 6-8 hours. If I redo the piece I can probably get a little more efficient. I keep a stencil for most projects so I can recreate them if needed, or make variations.

Someday I would like to do that part of the process digitally so I can scale it to different sized pieces. I'm not well acquainted with digital art though. I plan on adding it to the repertoire someday though.