I want to get a tattoo

Time-wise, mine took an hour, so yours would take several, and is therefore something you'd probably have to get done in multiple appointments.

Just going to point this out: Unless things have changed, you will HAVE to get it in multiple appointments. An old friend of mine got his family crest done on his entire back about 3 years ago, and because of the excessive detail and coloration, they could only do it in segments. There's only so much your body can take, and the blood loss is too extensive on a full back + color design to be able to do it in one go.

You will also have issues where you have to wait a few weeks between each appointment, to my knowledge. It varies depending on how fast you can heal. Be aware you might have issues fitting between the two trips.

This may have changed by now, though. I'm speaking purely on what my friend experienced. I've never gotten a tattoo myself.