Feat here: https://youtu.be/FwxxWAiMEpw?list=PLaoJReF6xg7tSsBiAiIJDB-sqHJ2YWsop&t=514

Take-Mikazuchi is stored inside of a satellite, which can be anywhere from 160 to 2000 kilometers off the ground.

For the sake of fairness, let's go with the midpoint and say 1080 kilometers in the air.

The beam fires at 8:35 and hits Rachel’s shield at 8:40, giving a timeframe of 5 seconds.

1080 kilometers in 5 seconds is 216 kilometers per seconds, or Mach 634.75 (Massively Hypersonic+)

Using 2000 kilometers gets 400 km/s, or Mach 1175.468 (Massively Hypersonic+)