Comment by neonnomad

I've been running servers for the pool for years. They are checked regularly for accuracy/uptime or it's score goes down in the pool and eventually gets removed. I sync from 5 stratum 1 servers and use chrony these days.

Facebook had a really interesting engineering blog about building their own timeservers: https://engineering.fb.com/2020/03/18/production-engineering...

Really well written for anyone who is interested.