I do DR leveling on my BLM usual in my lunchbreak which is definitely off-time and get in 80% of all cases a less than 5 minutes.
And the reason to not queue in party make sense to me... I mean you could "bait" or "leave out" certain contents if you queue with really low levels. I really like that it takes atleast 3 contents and puts me in wherever I may fill the team.