Does OP realize that people don't looks at 11:55 and think it means 11:55:00, but they think, it is just not 11:56 yet. Computers and smart devices syncing to

Does OP realize that people don't looks at 11:55 and think it means 11:55:00, but they think, it is just not 11:56 yet. Computers and smart devices syncing to NTP doesn't have 30s average error rate, it is the author who has 30s average error rate in clock-reading if he reads a digital clock and think that the clock tells that no seconds has passed since the last time it added one minute.