Is it legal for a security guard to do a 20-minute night shift for five minutes at a time?

What you want to ask is whether it is legal for security guards to patrol for 20 minutes at night for 5 minutes at a time? Legal.

According to the Measures for the Administration of Security Services, it is legal for security night patrols to be spot-checked once every 20 minutes, with at least 5 spot checks each time. When the public security night patrol is fixed, it should be carried out in accordance with the prescribed time, place and order, and it is not allowed to skip or miss points to ensure the effectiveness of public security patrol.

Matters needing attention in public security patrol include not searching other people's bodies or seizing their legal documents, and wearing uniform public security uniforms and uniform public security special signs when performing tasks.