"Making his way toward the pitch-black fortress, Xue Ying had crossed more than twenty-five thousand kilometers in the blink of an eye. The fortress was gradually grown in size in his vision when he suddenly revealed a frown. He saw a passage opening up at the top of that fortress, from which a stream of particles flew out from to head toward him at top speed."

As you can see it's said that he "crossed more than twenty-five thousand kilometers in the blink of an eye"

We'll use a baseline of 25,000 km.

How long is a blink of an eye:

The blink of an eye takes 250 milliseconds.

Distance: 25,000 km

One second would be:

25,000km/1/4s = 100,000 km /1s = 291545.19 mach or 0.333564095765c = 33% SoL (Relativistic)

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