ARXW
I remember when Pugachev arrived at Paris 1989 in his Su-27 and did a few manoeuvres on arrival. I also remember the expression on the face of a BAE man when he looked up from his stopwatch and said "that 360 took 10 secs". Then a short while later Pugachev did the first cobra we had ever seen in the West while on his downwind leg to land. We nearly forgot about the 360.
BTW I am not suggesting that represents a sustained turn rate just a short term average. In the following years I timed quite a few such 360s at Paris and Farnborough but never got under 11 secs myself.