Comment 1 for bug 1253576

We don't time hooks out -- some of them legitimately take a very long time to run. If the hook is unable to complete, it's responsible for failing out on its own.

 https://bugs.launchpad.net/juju-core/+bug/1254766 (which we intend to fix by 14.04) may be somewhat relevant -- it would allow you to distinguish between a ready and an unready mysql.