Mohsen Kadivar

"There are approximately 100,000 clerics in Iran and over 60,000 of them are in Qom. Most of them are theology students who have been studying there for many years, between 10-25 years on average.... Every student has to study a minimum of 25 years before he can attain the status of ‘ayatollah’, however most students spend 10 years studying in the hawza."