Welcome to the guild. My fantasy novel and roleplaying game map portfolio is available for your perusal (it's pretty self-explanatory) and I offer both cheap slow maps for indi creators who just want a nice piece for their game and blazingly fast maps for those in a hurry to get a map for their next game / other project. Since I'm very flexible it's difficult to give any estimation, I would rather know what you would ideally want to have happen for a turnaround and let you know if that's feasible. There are many awesome talented artists here with a range of styles, so I would hope you make your decision based on which art you love the most and envision being able to capture your world.