From him, from Al-Qasim ibn Muhammad from Ali ibn Abi Hamzah from Abu Basir, who said:
I asked Abu Abdillah عليه السلام, about the minimum of the qunoot. Imam عليه السلام said: "Five tasbihat (saying SubhanAllah five times)."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 339