About 3 or 4 inches.
4 seconds sound clip from the The Green Hornet, Ep: 10, 11, 24, 25 TV Series.
You can hear this line at 00:49:44 in the DVD version of the movie.
Quote context
[...]
- In that instant the car should move away.
- What if it doesn't move fast enough?
- It's the only chance that we got!
- When that police car gets in the area, its vibrations are gonna set off the explosives.
- How close is your hand to the rocket switch?
- He said any movement would set that thing off!
- We're just going to have to risk it.
[...]