[duskwuff]

Maybe they've mixed up ms and µs? Their claim of "between 100ms and 250ms" for NTP also seems way too high.

[hnkimb3558]

These are conservative upper bounds and are meant to encompass long tail offsets. You can usually get NTP down to < 10ms offsets, but if you rely on that, you'll likely run into problems which end up violating your database guarantees.

[jschwartzi]

It likely has more to do with network latency than with any fundamental physical limitation of the system.