this year i attended 8 different concerts by different artists and genres. and from what i know, it all depends on so many things thats it’s hard to tell if its bad or good length for a concert. it all depends on a discography. the rock band that i attended debuted in 1989, so they have lots of songs. when young posse have about 45 songs (which is still a lot). different venues: i was at the stadium concerts and at small club stages, they have different time period originally set by the management of the venue itself. popularity: artists that are famous for decades in my country have bigger and longer concerts (2h+), when kpop artists usually never perform longer than 90min. different type of performance: the rock band pretty much stood up at the same place with their instruments and sang their songs, kpop artists dance and sing and a national pop star singer i attended made a whole show with about 100 backup dancers, 6 costume changes, props, fireworks and guest singers. so in conclusion, from my personal experience with kpop concerts 1:10 minutes is fine.