Security 10, four days off a month. How do they change shifts? How to arrange it?

Suppose there are one or two positions that can be arranged like this:

8-hour system: 2 in the morning shift, 2 in the middle shift and 3 in the night shift. 1 The team leader is responsible for the overall security work, and 2 are responsible for the rest after work. Everyone has four days off, and 10 has 40 days off, so the two people in charge of the first class have enough rest. One of the two people in charge of the first shift may also be appointed as the vice captain, who will be responsible for the overall work in the absence of the captain. The lieutenant can also cover for the shift.

12-hour system: 3 people in the day shift, 4 people in the night shift, 2 people in shifts, team leader 1 person.

In short, work and rest on demand.