All modern Navy ships have remote manual backup control of the rudder. I imagine this class of ships does too. The problem is that manual control is a very slow and tedious process. Can you imagine trying to move that size of a rudder with a little hand crank? I’ve tried it...it ain’t fun.
Anyway, it was about four minutes from the initial loss of power to the collision with the bridge. And the collision only happened at about 1.5 knots.
Thank you for your knowledgeable comments. Would be interested to know how you know the speeds with such precision. Could be derived from videos, I suppose, if the viewing angle were right. Or from telemetry from the ship, of that wasn't knocked out by the power failure. Do ships that size have a hulking great tiller? Or a gear of some sort above the stuffing box?