How long can airport security labor dispatch last?

How long the airport security labor dispatch can be divided into the following three situations:

1. Airport security companies need to engage in security inspection all the year round, and dispatching employees needs to work all the year round. Generally, dispatched employees will sign a one-year labor contract. If it is necessary to renew the contract, they can negotiate with the company.

2. Airport security companies need to engage in seasonal security inspections, and the working hours of dispatched employees will be determined as needed. Generally, dispatched employees will sign short-term contracts, such as one month or several months, and then decide whether to renew the contract after the expiration.

3. Airport security companies need to engage in security inspection of specific projects, and the working hours of dispatched employees will depend on the needs of the projects. Generally, dispatched employees will sign short-term contracts, such as six months or one year, and then decide whether to renew their contracts after the expiration.