During the Tang dynasty, successful candidates reported to the Ministry of Personnel for placement examinations. Unassigned officials and honorary title holders were expected to take placement examinations at regular intervals. Non-assigned status could last a very long time especially when waiting for a substantive appointment. After being assigned to office, a junior official was given an annual merit rating. There was no specified term limit, but most junior officials served for at least three years or more in one post. Senior officials served indefinitely at the pleasure of the emperor.