No clue how you are coming close to a timer. I have never hit the time until we were learning coil fights. Even in AK when no one really had gear we cleared it in time. Now its a joke. In and out in under 30 mins without skipping trash.

The only reason this would even be an issue is in the case of a dc that doesnt come back. Adding more time isn't the fix for this. Finding a way to get more people running dungeons is. Like increase the exp from dungeons to make them comparable or better then fate grinding