User blog comment:Aziz91/new Volume/@comment-25599611-20141106091939

from volume 1 to 5 is kinda like this (source baka-tsuki).

Volume 1 January 23, 2014

Volume 2 March 22, 2014

Volume 3 May 23, 2014

Volume 4 August 25, 2014

Volume 5 October 24, 2014

by looking, it'll probably have 2 - 3 months till the next volume is out..