in a heartbeat
(idiomatic) Without hesitation or reservation; at once.
We like to think of life as a constant ... Yet it can be ended in a heartbeat. David Gemmell
God, I love the "fine morality" of the wealthy and powerful. You'll spill tears over your own, in a heartbeat. And then never even look twice at people below you, whose very lives are ground under every day, day after day, year after year. David Weber
When I have an idea, it goes from vague, cloudy notion to 100,000 words in a heartbeat. Lynn Abbey
This country will kill you in a heartbeat and still people love it. Cormac McCarthy
If I had to give up cheese or chocolate, I'd give up chocolate in a heartbeat. Amanda Peet
I would work with any one of them again in a heartbeat because it was joyous and incredibly easy. Jason Alexander