1- In no time (at all)
2- Before you know it
3- As quick as a flash
4- in a jiffy
5- In two shakes of a lamb`s tail
6- In a Flash
7- in the blink of an eye
8-in a sec.
9- in a split second
10- in a heart beat
11- at the drop of a hat
12- before one can say Jack Robinson