I think just a character, normalmaps, animation etc... could be done in a few days. Of course, this assumes you have years of experience(which you said) and that you are working with software you already know well, and that you work full days, like 8 hours or more each day. Also, this could be even longer if there are more animations than I'm guessing would be needed for this game.
But, this wouldn't include more textures, rather only just the one.
Lastly, remember that a single character like this is likely the least of your worries if you were to make a modern Final Fantasy game. Any good RPG needs tons of environment variety, tons of different enemies, a good story, and most likely many nice videos to go with it. This is on top of the engine programming, etc... This is why a single person doesn't do this kind of project easily. Even if you went with a simple 2d RPG, and even if you used RPGMaker to do it, if you make several hours of gameplay(and you care about quality) it will still likely take months for a single person, simply because even with simple sprited 2d art, there is simply too much of it to finish quickly.
EDIT***
I forgot to mention, I myself DO NOT have those years of experience, though I know my way around Blender and can handle making any model I need. Someone else may know better than me just how long art assets like those take to make, but I don't think I'm that far off, though it depends on the software knowledge and experience of the individual.
I myself think if someone gave me concept art, I "might" be able to do such a model in a week, animations and all, working 8 hours a day. I would have to give myself more time because I don't do all that much modeling, and don't have the practice other artists would.
