On Monday, November 20, 2017 at 12:48:10 AM UTC-7, Paul Schlyter wrote:

Do you really time to a fraction of a second when you bake a cake in
your oven?

Obviously I am being as pretentious as those people who came up with "leap
seconds"!

You are quite correct I let the basic principle get in the way of practicality in
my choice of example.

John Savard