Examples:

• If the situation were reversed, she'd do it for you in a heartbeat.
• I tell you, get on that A train you're here in a heartbeat.
• Honey, you know that Danny would take you back in a heartbeat.
• Everything that was certain can change in a heartbeat.
• Yes, life as we know it can change in a heartbeat.
• Everything that was certain can change in a heartbeat.
• That could go from bad to worse in a heartbeat.
• You need anything, I'm on a plane in a heartbeat.
• I can walk away from all this in a heartbeat.
• I would take a bath with this dude in a heartbeat.