How many years did prophet Mohammad was calling for Islam in Mecca and Madinah?

Revelation of Quran in Makkah (Mecca) was over a period of more than 12 years while Prophet Muhammad was in Mecca (Makkah).The holy Quran which Muslims believe the final revelation started when Prophet Muhammad was 40 years old and it ended when prophet was 63 years old. A total of 23 years.