We studied a plan of the steering pedestal, and the gearing inside indicates that the wheel turned through three full revolutions from midships to hard over.
You can see in this picture below. F is the a stock that moves backwards and forwards as the worm gear E rotates. By observing the pitch of the worm gear, it can be seen that after the 3 rotations in either direction the stock comes to a stop.
The wheel, when rotated, used hydraulic oil to open a steam valve on a huge steam steering engine, situated above the rudder in the stern. This engine would then kick in and rotate the rudder until the valve closed again. Not sure how fast the rudder moved, but it most certainly would have moved slower than we have it just now in the sim, as it would have lagged behind the wheel some seconds.
Jason