How far a barrel will rotate after breaking torque depends on the individual gun and barrel and on how hard the gunsmith turns the frame wrench.

There is no specification for barrel torque on one piece barrels.
This is a judgment call by the pistolsmith based on where the barrel shoulder contacts the frame and how far it needs to rotate to have the front sight at 12:00 O'clock top-dead-center.

What's needed is enough torque to insure the barrel won't loosen under vibration, but not so tight that there's a risk of pressure compressing the bore or bending or cracking the frame.
This is based on the pistolsmith's experience and judgment.

I'm sure S&W has a torque spec on the new one piece barrels, but that's due to the different assembly method.