Like 3momchaos said, it can depend on insurance and it also depends on the surgeon's schedule. I was told to allow for 2 weeks for insurance to get back, although they ended up approving it in just four days, so you never know. After that, it was all up to the schedule of my surgeon and it ended up being three weeks after insurance approval. It also depends on what sort of pre-op diet the surgeon wants you to follow, which can be two to several weeks prior to surgery. My pre-op diet was three weeks.