Length for AES256 symmetric encryption passphrase?

[Sam Gleske]

On Fri, Apr 4, 2014 at 2:04 AM, Robert J. Hansen <rjh at sixdemonbag.org>wrote:

> Using plain English for the passphrase, a 170-character passphrase is
> necessary to provide a full 256 bits of entropy.
>

Interesting math.  However, I believe the OP mentioned they're generating
the password and storing so human readable, i.e. English, isn't an issue.
What would be the recommended length for completely random characters
generated, for example, by a password manager such as keepassx?

SAM
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