The Mosquito Girl in her enhanced form moved so fast that it was as if she teleported a long distance for Genos.
In the anime, this is also shown as a FTE for Genos.
Maybe it's worth trying to find the distance traveled divided by 1/220 of a second (People's perception, usually used if the character seemed to teleport for people. Genos is faster than a person, so this is the minimum)?
To get Mach 10, you need to go for such a time approximately. As we can see on the scan, it was higher than the buildings. It at least scales up to Post G4.