User blog comment:Xilinoc/Ch. 564 (Mask is too fabulous to live)/@comment-117598-20140115180531/@comment-5693502-20140115193111

Well both Urahara and Ichigo bypassed the proper training and achieved an assumed 'full' bankai within three days. But anyway, Renji has been training with Squad Zero as well so you have to take that into account too.

That was a pretty decent chapter though, liked the twist.