There is no relevant requirement on whether to take time off in the Second Construction Examination, and you can fill it out normally even if you don't take time off.

Those who have obtained the qualification certificate of construction engineer and meet the registration conditions shall obtain the registration certificate of second-class construction engineer after registration, and the registered construction engineer may take up his post to practice. Before the expiration of the registration period of the construction engineer's practice qualification, the re-registration procedures must be completed. The qualification certificate of the first-class registered constructor is universal in the whole country, and the second-class constructor can be called the registered second-class constructor as long as he is initially registered, which can be universal in the whole country.