Jami` at-Tirmidhi 704
جامع الترمذي#704SahihAnas (bin Malik) narrated:(Another chain) except that he said: "About the length for reciting fifty Ayahs
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 8:23