God knows who planted the 6 minutes. The response time is dependant on the distance of the base from the border, the alert aircraft present..and the heading of the intruders. The first and last are not in the control of any side. The middle, the status of the alert craft, the preparedness of the aircrew and support crew.. and the ability of the intercept controller to plan out an intercept most efficiently(yes folks, this is an art in itself). It also matters if there were aircraft in the air already, then the time shortens even further.. But essentially, aircraft like the JF-17(and even the F-7) are capable of going from cold position to in the air within 4-5 minutes...and this 4-5 minutes includes aircrews running from their ready room all the way to the jet. IF there are aircraft already on alert status with the pilot in the cockpit.. this time to take off and be in the air shortens further.
6 minutes however, may not be impossible. It sometimes happens that aircraft on the side of the border are picked up heading parallel to it(be it the Pakistani side or the Indian one). The phone rings, aircrews are ordered into their aircraft and they sit on alert status awaiting further instructions. Given the call that the suspect target has indeed turned towards friendly airspace... scrambles usually take less than 3 minutes.