Answered by Shaykh Faraz Rabbani
What is the minimum that must be recited in one’s qunut dua for one’s witr to be acceptable, i.e. can one shorten the masnun qunut dua to a few lines?
Answer:
Walaikum assalam wa rahmatullah,
I pray that this finds you well, and in the best of health and spirits. May Allah grant you all good and success in this life and the next.
Minimally, the necessary (wajib) duty to recite the qunut in witr prayer is fulfilled by any supplication whatsoever. Optimally, one should recite the sunna supplication.
[ Ibn Abidin, Radd al-Muhtar ]
Faraz Rabbani