hatakashi

Finally I got a few minutes to dig into my books.
This time I use the simplied version of T. Jentz's Tiger II book, I use New Vanguard's King Tiger Heavy Tank, on page 24.
"...with the high range power traverse engaged and the engine turning over at 2000rpm, the turret could be traversed 360 degrees in 19 seconds. At the maximum allowable engine speeed of 3000rpm, the turret could be traversed 350 degrees in less than TEN seconds..."

So yes Rivet is right, the KT turret could do a full swing in less than 10 seconds.