Coffee Break: Join us on Wednesday, April 5th at 10am PT to chat with Ben Gaines, Director of Product Management for Adobe Analytics. Ben will be online to answer your Analytics and Adobe Summit questions.
In a visit, the time spent by a visitor to reach a page / fire a success event should also be availble as a metric. Would helps in understanding 'desired' vs 'actual' event completion periods.
There's a plugin, getTimeToComplete, that will actually do this. You just config the plug-in to track the time between two specific custom events. If you wanted it for each visit you could just fire an event upon the initiaion of a new visit and then fire the second event on whatever your conversion event is.