Dawn of the Infinites was available for Mythic+ testing on the 10.2 PTR and we're showing how much RP currently remains in the dungeon.
There's a lot of unskippable RP that still remains in this dungeons, with most of it occurring between the 3rd and 4th bosses. While some of the RP has already been cut, it's still a lot of time standing around and doing nothing!
In Iridikron's Fall, there's about 2 minutes of unskippable RP where nothing is going on. This already includes a ~45 second reduction in the big talk after Galakrond.
That's a lot of standing around doing nothing in a Mythic+ dungeon!
In Murozond's Rise, there's about 3 minutes of unskippable RP where nothing is going on. This already includes a ~30 second reduction in the big final talk being Chrono Lord Deios.
This doesn't include ~30 seconds of RP where Tyr is being summoned, but you can clear extra trash during this time.