Man page entry for MaxCircuitDirtiness is incomplete
The man page description of MaxCircuitDirtiness doesn't mention that it is applied based on the last time a stream was attached to a hidden-service rendezvous circuit, rather than the first time as for general-purpose circuits.
It also doesn't mention any minimum or maximum values. (I sure hope there is a minimum value -- we don't want users thinking that it's specified in minutes and setting it to 5.)