Kpop Idol Period. However it depends on who it is. Ryeowook Kyuhyun Chen Baekhyun 2AMs Changmin Hara and Jiyoung.
This was the driving force that also led to the formation of all your favorite idol groups with SM Entertainment being established in 1995 JYP Entertainment in 1997 and YG Entertainment in 1998. Super Juniors Kyuhyun - 3 months Kyuhyun joined SM in 2006 which gave him only 3 months to train before debuting in Super Junior. However some idols have been in the industry for longer just due to how long their trainee period was.
While some took several years or a decade before their debut others eventually gave up their dreams due to the pressure and difficulties of making it a star.
This was the driving force that also led to the formation of all your favorite idol groups with SM Entertainment being established in 1995 JYP Entertainment in 1997 and YG Entertainment in 1998. Sometimes idol group members would end up pursuing different careers such as continuing as solo artists turning to acting or becoming a TV host instead. Online Audition has ended. In a group like snsd with NINE members i would bet at least every 2 weeks if not every week one members period will come and i cant imagine them having to dance comfortably.