The number of days for general surveillance playback varies depending on many factors. The following are the approximate number of days for surveillance in some common places:

Community surveillance: Usually it can be replayed for about 15-30 days. However, if it is a high-end community or a key security area, it may be extended to 60 days or even longer. If a major incident occurs in the community, such as a criminal offense, the surveillance data must be kept for a long time as required by the public security organs.

Entertainment venue surveillance: such as cinemas, etc., can generally be replayed for about 15 days.

Hotel surveillance: The state now requires hotel surveillance videos to be kept for more than three months.

Financial venue surveillance: The surveillance of banks and other financial institutions can usually be replayed for 3 months to half a year.

Road traffic surveillance: The surveillance at the intersection is generally kept for about 3 months, the surveillance of the main road is usually kept for about half a year, and the video file of the road monitoring system of the traffic police department can usually be kept for about 3 years.

Public security surveillance: The storage time of general public security surveillance videos is about 2 weeks to 2 months, usually about 1 month.

Home monitoring: depends on the capacity of the storage device, the number of cameras, image resolution and quality, etc. If the memory is not full, the previous recordings will be kept. If the hard disk capacity is small or the number of cameras is large and the image quality is high, the storage time may be shorter, generally ranging from a few days to several months.