Or the S-3, for that matter, which used the same engines as the A-10.
It's important to remember that, on a turbo like a P-3, the "instant response" so bandied about comes NOT from the engine being able to spool up fast, but from the fact that the thrust produced is caused by the prop BLADE ANGLE. The engines themselves only have two settings...high and low RPM. The power levers control prop pitch. Changing that pitch changes thrust.
Blade changes probably aren't instant either, I'd guess 2 seconds from fine to course.