Board Thread:General Discussion/@comment-10786787-20130613005503/@comment-8986886-20140330173722

Kyūkyoku KON wrote: You mean like Ichigo? Ichigo whips out his Bankai more than any other character in Bleach. Although in Ichigo's case his Bankai is the only one that's useful long term. Everyone else's seem to be intended as a final, decisive blow.

It's possible that Ichigo's true Bankai is nothing like the speed boost of the Tensa Zangetsu that we know of, since the "old man" was suppressing it in the past. Maybe it's more like Mugetsu; a really powerful one-hit wonder?