Back in November 2011, Air Commodore Khalid Mahmood disclosed to the media that the JF-17 has already completed 10,000 sorties in the Pakistani service. That was over four years ago while there were only two JF-17 Squadrons operational with PAF. Since then another two squadrons have converted to the type, also in the last few years the JF-17s have been much more active, flying out and participating in several International air shows, carrying out strike missions against the terrorists and also taking part in ISAC and Fire-power displays.
So it wouldn't be illogical to conclude that in the last four years, the JF-17 must have tallied more than 30.000 sorties to it's credit. It's also worth pointing out that the only JF-17 loss occurred in November 2011, after it had completed the 10.000 sorties. Touchwood, last four years have been busy but incident free. Speaks volumes for JF-17's credibility.
Pakistan Air Force's JF-17 Thunder Completes 10,000 Sorties | Pakistan Military Review