Noun
English Wikipedia has an article on:proper timeWikipedia
proper time (uncountable)
(physics) time as measured by a clock following a timelike world line
Let us always guard our tongue; not that it should always be silent, but that it should speak at the proper time. John Chrysostom
Misses the tale that I relate - This lesson seems to carry - Choose not alone a proper mate, But proper time to marry. William Cowper
A man once asked Diogenes what was the proper time for supper, and he made answer, "If you are a rich man, whenever you please; and if you are a poor man, whenever you can." Diogenes Laërtius
After playing now for 60 years, it's still very challenging for me to play a simple melody and have it clean and touch the reed at the proper time in the proper way. Lee Konitz
A leader should have a quick intelligence. Time is a factor in all action. An imperfect scheme put into action at the proper time is better than a perfect one accomplished too late. Sometimes time is so important that it becomes the principal consideration. André Maurois
To one who asked what was the proper time for lunch, he said, "If a rich man, when you will; if a poor man, when you can." Diogenes of Sinope