You got the Asker's pick for being a good boy and for doing you're home work... The "you're" bit is to give Stu and that Randy D-evil something to do......hehe
In case you are wondering, yes, “shake” is a recognized unit of time. At the time of the first atomic bomb, scientists needed a term for an interval of time equal to 10 nanoseconds. Since two shakes of a lamb’s tail is very quick, scientists coined the word “shake” to describe this unit of time. But where does this phrase come from originally?