A Dictionary of Units of Measurement.
The in a vacuum provides a convenient universal relationship between distance and time, so in particularly in and often in , a jiffy is defined as the time taken for light to travel some specified distance.
You'll get there in a jiffy because all tolls are collected at highway speed which keeps traffic free-flowing.
This is a bit contrary to the more widespread use of the word.
In a jiffy What's the meaning of the phrase 'In a jiffy'? The business matter was settled in a jiffy.
Thanks to the minimal weight and four steering castors, you'll be mobile and have everything done in a jiffy.