Zone

Zonë is 'girdle' in Greek — a sort of belt, a circumferential locus. When Robin Goodfellow says he will "put a girdle round about the Earth in forty minutes"[1], it gives us a base speed for the faerie folk — since the Earth's equatorial circumference is 40,000 km or so, Puck must travel at a thousand kilometres per minute, or just about 17 km/s.

The faerie, it seems, are not faster than light. Sound, on the other hand, travels at only 340 metres per second, or 0.34 km/s. Puck could hit Mach 50 on a good day — 50 times the speed of sound at sea level!

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[1]: From A Midsummer Night's Dream, Wm. Shakespeare, c. 1590, Act 2 Scene 1.