Understanding the duration of Quranic revelation is crucial for grasping how Islam was gradually established. The Holy Quran was not revealed all at once but rather over a long period of time, addressing real-life events, issues, and questions faced by the Muslim community.

Revelation began in the year 610 CE when Prophet Muhammad (PBUH) received the first Wahi (revelation) in the Cave of Hira. This marked the beginning of the Makki period. The revelations continued throughout the Prophet’s life in both Makkah and later Madinah.

According to authentic Islamic sources, the complete revelation of the Quran took approximately 22 Years, 5 Months. This span includes:
- Around 13 years in Makkah where the focus was on monotheism, morality, and spiritual reform.
- About 9 years in Madinah where the Quran guided the Muslim society in governance, laws, and social conduct.

This gradual revelation allowed the early Muslims to absorb, understand, and implement Islamic teachings in a practical way. It also ensured that divine guidance was always relevant to their circumstances.

This timeline is agreed upon by leading Islamic scholars and is widely accepted in Islamic history studies.