Definition of «fleeting time»

The phrase "fleeting time" means that time moves quickly and doesn't last long.

With four children, we know how it quickly they grow and how fleeting the time is! (attachmentparenting.org)
He does at times expresses that he misses the whole me that he's had at fleeting times, but at times so do I. (birthwithoutfearblog.com)
The start of another new year reminds me how fleeting time is. (incourage.me)
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