How many days did it take for Beijing to supervise letters and visits successfully?

90 days. Letters and visits in Beijing undertake the comprehensive services, information protection and acceptance of letters and visits by the Municipal Letters and Visits Office. And it takes 90 days to supervise successfully. Letters and visits refer to citizens, legal persons or other organizations reporting the situation to state organs, making suggestions, opinions or complaints through the Internet, letters, faxes, telephone calls, short messages and visits.