I feel like you. My twins are 16 months now, and they keep biting my nipples. I love our relationshhip, but the lack of freedom to get stuff done and the biting are really getting to me. They still nurse quite a bit frequency wise (7 times), but not duration wise, sometimes it is only 3-4 minutes more so in the evenings. I am going to stick it out through the holidays since we are traveling and then get serious about weaning/cutting them down. My first was down to three times a day by 14 months and then weaned by 16 months.