Of course if you're not in combat, chances are you're not giving excess edge away, so it's expensive. And if you somehow try to do something that would give you 4 Edge in 1 action, I'd probably start frowning as GM. But yeah, sounds like the limits aren't that strict when you're not doing things 3 seconds at a time.
@jacx: Yeah, that sounds like it might become Edge abuse if the interrogation isn't actually necessary.