English ⇄ Russian

in a blink of an eye stresses
gen.	в мгновение ока (denghu)
amer.	в одно мгновение (In the blink of an eye the handsome prince was transformed into an ugly frog. Val_Ships); вмиг (There was a huge "boom" and in the blink of an eye the buildings were gone. Val_Ships); моментально (extremely quickly Val_Ships)