How long does the myectomy surgery take?

Varies. Myomectomy is generally done to improve fertility in patients with uterine fibroids or reduce fibroid symptoms in patients who still wish to conceive. Surgery can be quick if only a few strategically-placed fibroids are removed, or hours in cases of severe disease. Hysterectomy is generally quicker and less-involved in people with complete family status.
Depends. The time required to perform either laparoscopic or open myomectomies would depend mostly on the number of myomata (fibroids) being removed. The size of the fibroids would also likely have a significant impact on the amount of time required for the surgery.