I flag up for WP DF as WAR with my wife on SCH. This set up already means we can't do a true speed run.

My War is adequately geared (relic and all but 2 DL - this isn't my 'main') and my wife's SCH is better geared.

Consequently, I can set the speed of the run and I do so based on the party makeup.

Largely i90? As close to a true speed run as my gear allows
All relics? 2-3 groups per pull.
i-level 60-70 and no BLM? 2 groups per pull (give or take)
2 new players who've never done it before? 1-2 groups per pull and explanations before bosses.

The worst runs don't take 15 minutes longer than the best runs and the fact that I get insta-queues means I can afford to take my time with new players. I think a DD is the last person who should be concerned with how long a run takes. How much is 2-3 minutes really when you're waiting 30 mins between runs?