How many katibeen e wahi in prophet's duration?

During the Prophet Muhammad's lifetime, there were several scribes known as "katibeen e wahi" (scribes of revelation) who were responsible for writing down the revelations of the Quran. The most notable among them were Zayd ibn Thabit, Abu Bakr, and Umar ibn al-Khattab, but there were others as well. Historical accounts suggest that the number of scribes varied, but it is generally accepted that there were around 10 to 15 key individuals involved in this task throughout the Prophet's mission. Their efforts were crucial in preserving the Quranic text as it was revealed.