in the blink of an eye
- instantBriefest unit of time
- flashBrief burst of light
- momentBrief period of time
- split-secondFraction of a moment
- heartbeatRhythmic cardiac contraction
swift · sudden · quick · rapid · fleeting · blink · snap · twinkle · whoosh · lightning · flicker · vanish · gone · blur · whirlwind · eyeblink · jiffy · wink
speed/duration
in the blink of an eyeover time
Across a duration
slowly · gradually · at a snail's pace · in due time · eventually
perceptibility of change
in the blink of an eyebit by bit
In small increments
incrementally · imperceptibly · progressively · by degrees · methodically