Comment by ta1243

No, it's 2.3ms per day slower every 100 years. After 100 years the cumulative "loss" would be 100365.25(2.3/2), or about 11 hours, but each day would be about the same length as it is today.

If rotation was 86400 seconds per day today, then in 100 years time it will be 86,400.0023 seconds.

In 1,000 years time it will be 23ms slower

In 10,000 years time 230ms slower

In 100,000 years time 2.3 seconds slower.

In 1 million years 23 seconds, a 86400s day will take 86423 seconds

In 43 million years at that speed of 2.3ms per 100 years, a day will take 86,989 seconds, or 24 hours 16 minutes.

(there are other factors effecting earth's rotation)