time flies

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time flies [idiom]

used to mean that time passes surprisingly quickly

Example: 

Time flies when you’re with friends having great time.

Oxford Advanced Learner's Dictionary

time flies

time ˈflies idiom
(saying) time seems to pass very quickly
How time flies! I've got to go now.

Time has flown since the holiday began. This phrase is a translation of the Latin ‘tempus fugit’.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

time flies saying

C2 used to mean that time passes surprisingly quickly:

Time flies when you're having fun.