On Tue 2022-10-04T14:20:46-0700 Paul Eggert via tz hath writ:
Predicting length of day (LOD) is a tricky business with no real consensus. That being said, Tyler predicted that for the next 3 billion years LOD will increase roughly linearly, to 30 hours. So assuming our timekeeping civilization lasts long enough, eventually we'll need something, even if it's not leap seconds.
A decade ago two state of the art atomic clocks would agree with other within 1 second after 300 million years. In 300 million years a calendar based on purely atomic time will have counted 3 billion more days than have been witnessed by people living on the surface of Earth. -- Steve Allen <sla@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m