How many hours to burn off 12. 7 ounces of 80 proof vodka?

12.7 oz of 80 proof vodka translates to 12.7 oz * 2/5 = 5.1 oz * 0.79 = 4.0 oz * 28.35 = 113.4 g alcohol at 7g per hour = 16 hours and 15 minutes. Approximately, of course, and it may be different for males and for females. So don't rely on being sober the next day!