Thanks for the information!
As Aderianu said, I think the 9 hours only was a mistake because on livepocket.jp :
https://t.livepocket.jp/e/sd-j-
受付日時 2017/6/16(金) 15:00 〜 2017/6/
23(金) 23:59
I believe we have a week to apply for tickets.
I'm definitely going to the Ichikawa one by the way (11/21), it'll be my first Ayu concert!