In response to the recent dungeon updates, Jon Peters had this point of clarification to make:
Plain and simple this system is a safety net for stopping crazy farming when people find exploits that make each run super fast. We are also addressing those loopholes, but that takes time and new ones might always be discovered. If you and your group do the dungeons without skipping large sections and run different chains this system shoul(bugs aside) never impact you.
Addendum for clarity, super fast means < 30 minutes, and even then you must hit that speed multiple times in a row before you start seeing any impact.
Original post can be found here: [link]