C. F. Keil and Franz Delitzsch on 2 Chronicles 30:26

2Ch 30:26

The joy was great, for there had not been the like in Jerusalem since the days of Solomon. The meaning is, that this feast could be compared only with the feast at the dedication of the temple in the time of Solomon, 2Ch 7:1-10, in respect to its length, the richness of the sacrificial gifts, the multitude of those who participated, and the joyous feeling it caused” (Berth.). The feast at the dedication of the temple had been a festival of fourteen days; for the feast of tabernacles, which lasted seven days, came immediately after the proper dedicatory feast, and since the time of Solomon all the tribes had never been united at a feast in Jerusalem.