Botox injection of stovepipe is not a once and for all thing. Although the effect is obvious, it has a stovepipe effect in a short time. After more than half a year, the muscles of the calf will still appear slowly. If you want to have slender calves, you must repeat them to maintain the effect. Generally speaking, the effect of stovepipe needle injection can last for more than half a year. However, the retention time of stovepipe needle is not fixed. Good maintenance and proper exercise can appropriately prolong the effect of stovepipe.