Half an hour. "Tianmen Youdao" is one of the three ace performing arts programs in Luoyang City in Sui and Tang Dynasties. As of February 2023 1, the performance time is half an hour to avoid the crowd. Performance refers to a cultural performance in which a performance unit or individual performs operas, dances, folk arts, acrobatics and other talents in front of an audience at a specific time and under a specific environment.