Hard to say I know my half sleeve took 7 1/2 hours and its very detailed but it was also b/g and done with the new Numa gun witch is quicker and less forgiving it also depends on how long you can sit

It depends on a lot of factors. here are a few: Is he going to line and then shade or do the whole thing with a shader? is he going to draw it on you or is he going to use a stencil? is it going to be color or black and grey? how fast does your artist work? How good is he? How much detail are you looking for? How focused is he? How much pain can you take in one sitting?

There are many more… the truth of the matter is that it can take anywhere from 5 hours to 30 hours. This question and the next logical question- how much will it cost- are things that we can’t really answer for you. Find an artist, work it out, post some photos.