How long has Man Wenjun been in prison?

In 2009, Man Wenjun and his wife were taken away from the bar by Beijing police on suspicion of gathering people to take drugs. The reporter called the Information Office of Beijing Public Security Bureau, and its staff revealed that Man Wenjun and his wife had been administratively detained by Beijing police for taking drugs. According to the staff, more than 20 people in the bar room were taken for urine test by public security personnel that night, and 10 people were positive for urine test. According to the Regulations on Public Security Punishment, the police immediately made an administrative detention decision, in which Man Wenjun's wife Li Li was criminally detained on suspicion of providing drugs. However, Man Wenjun was detained by the police for 15 days after the police checked him and made a written record to admit the fact of taking drugs.