It's 12-16 ounces/day depending upon your own body's needs. Different people have different needs and, of course, men need more. 12 ounces 18-20 grams seems to be average.

One of the problems with women, especially women coming off low fat seems to be getting enoug protein.

Just remember that you can eat too much protein and if you do, the excess will be converted to glucose and raise your insulin levels.