blink of an eye
     n : a very short time (as the time it takes the eye blink or the
         heart to beat); "if I had the chance I'd do it in a
         flash" [syn: {flash}, {heartbeat}, {instant}, {jiffy}, {split
         second}, {trice}, {twinkling}, {wink}, {New York minute}]
Source: WordNet® 2.0