For me, after about 5 cm of lengthening. Which means that clicking is hell for the first 6 weeks. I took pain meds 45 minutes before clicking and it helped. After 6 cm, clicking was a total joke I was laughing.Scenicdrive is exactly right. In the summer I can come to party without crutches. Not putting up pics. For those who are wondering: I started on some clicks but really stressing because for me almost impossible: sooo insainly painful. They say is loosens up & gets better; WHEN??!!