Bank Roll question for mid/high stakes NLHE

Ive been playing NLHE on party for about 2-3 years. Im thinking of making it a full time job. Ive been playing NL 200 mainly occasionally stepping up to NL 400 and NL 600. To make this a full time job what would you suggest for a starting bankroll and approximately how many hours a week should I consider playing. Im only looking for around 800-1400 profit. Im a profittable player and have made money at this level for a few years now. Any thoughts are definately appreciated.