Artist/Drawing/Painter question ...?

So, watching the AFVideos on channel 5 before I order dinner and get ready for the overnight shift. Saw a kid pushing a toy inside a homemade cardboard box fort/castle, and moving the castle too.

Question is : About how long would it take a decent artists, or even a high-school poster painter, to turn an empty bix into a playhouse - say the box is roughly the size of a washer/dryer, or another box for something like a fridge if the kid's older? ...

Fair payment would be for say 4 hours work at about $9.00 - $12.00 per hour depending how much I like their particular style/design(s)?. [I'd supply the materials of course].

I'm guessing I'd just post an ad on Craigslist that I'm looking for someone to do it, and request some pics of what they could do ...

G'Luck!!