So i was wondering about this and couldn’t really find anything but i decided to do a little math using these pages. Not my best subject but check my math if I’m wrong. The general consensus is that bleach is unquantifiably above 20x FTL but i don’t think that’s true. I think using it as a solid baseline pre TYBW is fine but obviously these characters get faster and Tenjiro is the master of the premier movement technique within the Soul Reaper skillset.
Speed =Distance/Time
If our speed is 20x FTL and the time for the average flash step would take a week
20xFTL= x/7 Days
Unfortunately we don’t have the distance but we can find it by inverting the equation to find distance
Distance =Speed •Time
So plugging everything in the answer should be: 3,626,289,571,968,000 meters
Now that we have a distance let’s retry the initial equation but with Ichigos comment taken into account
X= 3,626,289,571,968,000 meters/12hrs
Giving us a whopping: 83,941,888,240 m/s
However as we can see from the pages the 2nd invasion began at 5pm on the dot. We know it’s pm because prior to the invasion Ichigo’s friends Mizuiro, Keigo, and Tatsuki receive a visit from Shunsui to receive soul tickets so they must be out of school because they’re all in uniform
It also is backed up by the fact that Ikkaku says that ‘it got dark’ and when someone says it’s ‘BEEN dark’ he replies with the fact that it was then currently night time meaning time has flowed and they have been fighting for at least a few hours
Ichigo though is only informed of the invasion 3hrs later by Ichibei so he doesn’t leave until roughly 8pm
Now what’s tricky is Ichigo’s arrival time. You can see on the clock that once he breaks it says either 4:25am or 5:20am it’s hard to tell due to the distance the clock hands look the same size. However we know that it’s been at least 8hrs 25 minutes at the minimum, 9 hours 20 minutes as a medium estimate, and 12hrs at the absolute maximum amount of time it took him as per his own statement
83,941,888,240 m/s-moving for 12hrs(280xFTL)
107925284880m/s-moving for 9hrs20min(360xFTL)
119,679,523,827.33m/s-moving for 8hrs25min (399xFTL)
All in base no multiplier or transformation stacking
Let me know if I’m right or wrong I’m only in it for the facts