15 years

... for man who bit a chunk of his "girlfriend's" nose off.
From the SAO:

Bowers pled guilty September 8, 2009 to first-degree assault.
On September 27, 2008 police responded to the 300 block of South Street for a domestic assault call. Upon arrival the officer observed the victim with a paramedic; she was bleeding profusely from the nose and holding gauze to her nose in an effort to stop the bleeding. The officer asked the victim to remove the gauze pads and he observed that 1/4 to 1/2 of the victim’s nose was missing.  She reported that she and her former boyfriend, Darrel Bowers, were having a dispute over a house key that she had lent to him. During the course of the argument the victim told police that Bowers bit her in the nose so hard that he bit a portion of it off. Photographs were taken of the victim’s injuries and to date, she has had to reconstructive plastic surgeries, and will require several more.