ما كان رسول الله صلى الله عليه و سلم يزيد في رمضان ولا في غيره على إحدى عشرة ركعة يصلي أربعا فلا تسل عن حسنهن وطولهن ثم يصلي أربعا فلا تسل عن حسنهن وطولهن ثم يصلي ثلاثا

رواه البخاري:١١٤٧

“The Messenger of Allah (s) did not pray more than eleven raka’aat in Ramadan or any other month. He used to pray four raka’aat – and do not ask me about their beauty and length – then another four raka’aat  – and do not ask me about their beauty and length – and finally, he used to pray three raka’aat (Witr).”(Bukhari,  1147)?

This is regarding Tahajjud Salah (Qiyaam al-Lail), not Taraaweeh Salah (Qiyaam Ramadan) as is evident by

(1) ‘Aisha (r) saying that he (s) would not pray more than this in Ramadan or any other time.  Taraaweeh Salah is only in Ramadan, not any other time. Tahajjud however is performed all throughout the year.

(2) Imaam al-Bukhari (r)  lists this under the chapter of Tahajjud (chapter 25, subchapter 16).