I'm kind of curious about the actual accuracy of NTP. When I try to research the topic I hear stuff like "stratum 1 is fractions of a millisecond and stratum 2 is within 100ms" and then I see people ...

I have a few dumb devices (Gemtec IoT LoraWAN gateways) on one network that rely on NTP to function correctly. After they were installed, they worked for about 1 day then stopped relaying sensor info ...