Comment 4 for bug 1173738

This is a very old bug but I can see how even in impish the man page docs could be a bit confusing:

       -t <seconds>, --timeout <seconds>
              Set the global minimum timeout, in seconds, until directories are unmounted. The default is
              10 minutes. Setting the timeout to zero disables umounts completely. The internal program
              default is 10 minutes, but the default installed configuration overrides this and sets the
              timeout to 5 minutes to be consistent with earlier autofs releases.

The issue being that what's (correctly) described in the man page isn't what's implied by the option name '--timeout'. However, given how long that option has been available in practice, renaming the option is probably not feasible at this point. And, if it should be renamed, that is better discussed and performed upstream and not diverge from standard practice.