in a couple of shakes

1 马上

p.d.q. right yet soon immediately shortly instantly promptly momentarily forthwith sharpish pronto in two shakes without a second thought at any minute now in less next to no time in less than to no time on the nail right now at once right away right off anytime soon in no time any minute right off the bat this minute straight away any minute now at any minute

2 立刻

immediate instant instantaneous directly shortly instantly forthwith now-now at a single glance in two shakes in less next to no time in less than to no time on the nail in no time at a glance this minute like a shot