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 3 years ago 

I am guessing at least 10-16 hours. It was a while back, so hard to remember exactly.
Sometimes you have to tailor a drawing for the customer. Sometimes they just want you to draw a portrait from a photo.
In any case, you always have to make changes, add things, remove things, etc., because drawing is not like a photo, and it does not have colors.

Thanks for the info :)