I am still reading a book that I wanted to have finished last week; Management 3.0.
It takes me ages to read a chapter, because it is so packed. I am not really a slow reader, but some I re-read, I re-read and I re-read again.
It is not required to be a good manager, but if you want to understand things at it's core, it's definitely useful.
There is still a way to go ;)