For a chest piece like that you're probably looking at 10 hours. It's not very complex and any good artist could get it done in that or under that. That being said, it'll probably take more time than that. LOL
I've had a LOT of tats and it is totally dependant on the artist, what type of machine they use, how heavy of a hand they have, how much that actually give a shit...etc. Do not just go to the first guy you find and say "ok let's go", shop around.
I would also recommend doing a custom piece unless the pic above means something to you. Flash art is NEVER a good idea and is almost always regretted. See almost my entire left arm for details.
My right arm looks fucking bad add as does my left hand and leg. All fully custom pieces. Well worth it. Just be careful and do research.