3.18 Driver adjustable bodywork:
a single closed section situated each side of car centre line in the volume bounded by:
- lines 450mm and 800mm in front of the front wheel centre line;
- a vertical plane which intersects these lines at a distance 250mm from the car centre line;
- and the inboard face of the body work described in artical 3.7.5;
is allowed to change incidence while the vehicle is in motion within a maximum range of 6*, provided any such change maintains compliance with all of the bodywork dimensional regulations.
alteration of the incidence of these sections must be made simultaneously and may only be commanded by direct driver input and controlled using the control electronics specified in article 8.2. Except when the car is in the pit lane, a maximum of two adjustments may be made within any single lap of a circuit.
and i didn't bother typing up article 8.2, but there's nothing specifying any further the degree of driver input. in fact, it makes a lot of connections to the ECU, making it each easier case to let the ECU feed info to the steering wheel.
i dunno, it seems like there's no rules against having the ECU figure out the optimal angle for the front wing at your given speed, and then letting the driver push a button to tell the ecu to "make it so". definitely nothing about the time taken to make the adjustments.