Gin's Shikai speed

What he had just used was his Shikai, the special ability of his zanpakuto's Shikai allowed him to extend his sword up to 1.5Km with a speed at 50 times the speed of sound.

No normal shinigami could react to such an attack.

[343 m/s x 50 = 17150 m/s = High Hypersonic+]

-Gojo EPILOGUE 1: HIDDEN DANGER