转眼即逝 Origin — Dong Chinese Dictionary

zhuǎnyǎnjíshì

to pass in an instant

转眼轉眼 zhuǎnyǎn numeral

in the blink of an eye

Describes a very short period of time; in a flash or an instant
即 jí adverb

immediately

promptly; at once; indicates that something happens right after something else
逝 shì verbadjective

to pass by

(bound form) to pass by or flow away; used to describe the movement of time or flowing water