Also I would factor in sick time, when I was doing 400-500 hours a year as a corporate Pilot I seemed to suffer from lot's of colds/blocked ears and sinuses no doubt brought on from poor cabin air, constant pressurisation and de-pressurisation (remember in something like a King Air at high cruising altitudes the cabin ALT may be about 9-10,000feet, quite tiring after a while and I'm a fairly fit and healthy 32 year old), also you can probably write off at least one if not two months a year on maintenance if you are doing those sort of hours, especially on an older King Air.
My bet is you will be sick of the sight of a cockpit after six months of that amount of flying!
Most of us here are just jealous of course, I for one would love to be able to go flying whenever I wanted and in a great machine like the King air!