consider the word 'jiffy', as in "I'll be with you in a ~"

there are several accepted meanings of this word, in various disciplines...

a) 1/100 of a second
b) one millisecond
c) approximately(!) one nanosecond
d) indeterminate time from a few seconds to forever

http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?jiffy