Getting a half sleeve black and gray tattoo from my elbow to my shoulder with lots of detail. -How long will this tattoo take roughly? (My artist is out of town that is why I am asking for a rough estimate so I can gather close to amount it will cost)

It's a question you need to ask from the one who wants to do the job. Beside the length-width and the sizes. The individual involves as well! Maybe someone be so quick handed and some slow handed! (these kind of things) so you need to ask your tattoo host directly!