How long does the calligraphy exhibition last?

1 half hour. "China Calligraphy Conference" is a large-scale quarterly broadcast TV program of calligraphy culture launched by the Central Radio and Television General Station and the China Calligraphers Association. First broadcast on CCTV- 1 every Friday night, and rebroadcast on the science and education channel (CCTV- 10) at 20 o'clock the next day. The broadcast time is one and a half hours.