bb2ngster:

As of May 2013; I probably missed a lot. Add as you see fit. (Even if they debuted at the end of 2012, I still put 1 year, considering it was last year)

• Shinhwa - 15 years
• 1TYM - 15 years (they didn’t officially disband)
• TVXQ - 10 years
• Epik High - 10 years
• SG Wannabe - 9 years
• SS501 - 8 years
• Super Junior - 8 years
• Brown Eyed Girls - 7 years
• Big Bang - 7 years
• Wonder Girls - 6 years
• Kara - 6 years
• FT Island - 6 years
• SNSD - 6 years
• Sunny Hill - 6 years
• Supernova - 6 years
• 8Eight - 6 years
• SHINee - 5 years
• 2AM - 5 years
• 2PM - 5 years
• UKiss - 5 years
• MBLAQ - 4 years
• Supreme Team - 4 years
• 2NE1 - 4 years
• 4Minute - 4 years
• T-Ara - 4 years
• f(x) - 4 years
• Beast - 4 years
• Secret - 4 years
• Rainbow - 4 years
• CNBlue - 3 years
• Girl Story - 3 years
• GP Basic - 3 years
• Touch - 3 years
• One Way - 3 years
• Co-ed School - 3 years
• DMTN - 3 years
• Nine Muses - 3 years
• miss A - 3 years
• Girl’s Day - 3 years
• Led Apple - 3 years
• Teen Top - 3 years
• Infinite - 3 years
• Sistar - 3 years
• F.Cuz - 3 years
• ZE:A - 3 years
• Dal Shabet - 2 years
• RaNia - 2 years
• Block B - 2 years
• A Pink - 2 years
• B1A4 - 2 years
• Boyfriend - 2 years
• N-Train - 2 years
• MYNAME - 2 years
• AA - 2 years
• F.I.X. - 1 year
• Spica - 1 year
• B.A.P. - 1 year
• EXO - 1 year
• EXID - 1 year
• Nu’est - 1 year
• BTOB - 1 year
• Hello Venus - 1 year
• JJ Project - 1 year
• C-Clown - 1 year
• Tasty - 1 year
• Evol - 1 year
• D-Unit - 1 year
• AOA - 1 year
• Phantom - 1 year
• Two X - 1 year
• Lunafly - 1 year
• VIXX - 1 year
• 15& - 1 year
• Toxic - 1 year
• Chaos - 1 year
• Nevermind - 5 months
• Ladies Code - 2 months
• Delight - 1 month
• History - 1 month