So I was thinking about the Beerus vs Goku battle, and I think something was overlooked. When Beerus nullifies the explosion from his and Goku's clashing attacks, it is stated the attack will destroy the Universe, and it shows the energy even reaching out into other realms as well within seconds even from the mere clash.
When Goku and Beerus energy waves clash and then explode after a struggle Beerus nullifies the very energy that is exploding and engulfing the Universe according to the narrator and kaioshin and would destroy it in that moment had he not.
So we should technically be able to say Beerus reacted to and nullified an energy explosion that can engulf the Universe and beyond in seconds. Theoretically this should put SSJG level fighters at hundreds of quadrillions of times ftl speed to Quintillions of times ftl at least.
http://i.imgur.com/At1Tria.jpg?2
http://i.imgur.com/55f8vro.jpg
http://i.imgur.com/MqP67jW.jpg
Video of Feat
https://youtu.be/7J2ASqX_FO0?t=59
For a specific calc we know the earth is on the edge of the Universe in Super, and the energy explosion will reach across the entire Universe and beyond to other world and Kaioshin realm. Since we don't know the distance beyond the Universe we can just use the Observable Universe as our distance to low ball the feat.
For a timeframe it clearly was at that moment, as the kais expected to die from the explosion right away as it exploded and they saw it do so, and the explosion was already appearing in their realm from the mere clash of Goku and Beerus blasts within a second onscreen. It seems to reach the kaioshin realm in a second or less in terms of onscreen time.
So for timeframe if we say high end is 1 sec and low end is 10 sec I would think that is fair.
High end
93 billion light years in 1 sec
879,800,000,000,000,000,000,000km / 1sec / 300,000 = 2,932,666,666,666,666,666 times ftl
Low end
93 billion light years in 10 sec
879,800,000,000,000,000,000,000km / 10sec / 300,000 = 293,266,666,666,666,666 times ftl
Edit:
This is measuring the speed of the ki blast collisions explosion, not the shockwaves, nor the light from the clash, so the whole shockwaves not following normal physics or being predicted arguments are irrelevant to this feat, as it is not one of the shockwaves but an actual explosion from the ki attacks.
Beerus is known to have not used full power, even to nullify the attack, as Whis says after the battle he did not go full power, apparently he only used equal power to Goku, since Goku continues to grow stronger and combated Beerus power which he used during the clash and nullification, in fact he said nullifying Goku's later attack would be more difficult.
So Beerus nullification reaction speed level should scale to all god tiers imo.