time flies
(idiomatic) Time passes quickly.
Synonym: tempus fugit
Time flies when you're having fun.
Time flies like an arrow. Fruit flies like a banana. Groucho Marx
Time flies and draws us with it. The moment in which I am speaking is already far from me. Nicolas Boileau-Despréaux
Time flies over us, but leaves it shadow behind. Nathaniel Hawthorne
Time flies when you are among friends. Basque Proverb
Time flies when you're having fun. English Proverb
Time flies with hasty step. Latin Proverb