User blog comment:Soulreaper1234/What's up with Ichigo and his BANKAI, is it in constant release?/@comment-1405841-20100915052358/@comment-1393830-20100915062819

Ichigo entered Hueco Mundo, fought Dordonni in which he released bankai, Grimmjow, Ulquiorra, Yammy and then left for FKT pretty much all on the same day. The only significant time that has passed is 3 months in the Dangai which is just a few hours in actual time. While in the Dangai, he was using almost no spirtual energy at all meaning he could sustain his bankai. He has not been in Bankai that long really. 1 day. Hitsugaya even said that as long as there is water around, he can regenerate his bankai