The first time at Farnborough it was 10 minutes, and even then on the first flying display, they had a compressor stall neccesitating a change of engine. I was tower controller, and as it was an engine on the blind side from the tower, none of us witnessed or heard it, and we were quite surprised when they abandoned takeoff.
I'm told the commentator (the inimitable John Blake) heard it and remarked 'Oh dear, how un-professional'.