Jiaxing Lego Toys Co., Ltd. may arrange a four-day rest for the following reasons:

1. Relieve employees' work pressure: By providing flexible working hours, employees can better balance their work and life, thus improving their quality of life and job satisfaction.

2. Improve employees' work efficiency: By implementing the four-shift work system, employees can have more rest time to recover their physical and mental state. This helps to improve the efficiency and productivity of employees.

3. Meet business needs: The four-shift work arrangement can be adjusted according to business needs to ensure that employees have enough time to complete their work tasks, and at the same time, they can also ensure their rest time.

4. Cost reduction: By implementing the four-shift working system, the company can reduce the salary cost of employees, because employees can improve efficiency and complete more tasks during working hours.

Generally speaking, the work arrangement of Jiaxing Lego Toy Company may be to improve the work efficiency and productivity of employees, and at the same time, it can also ensure the rest time of employees, meet business needs and reduce costs.