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How long did it take a Lightning to climb to 12,195 m?
Short answer
The documented climb figure is 36,000 ft (11,000 m), not 12,195 m: the Lightning reached it in under three minutes. Its optimum climb profile required reheat on take-off and gave a steady rate of about 20,000 ft/min (100 m/s).

The optimum climb profile
The Lightning's optimum climb profile required the use of reheat during take-off. With it, a steady rate of climb of approximately 20,000 ft/min (100 m/s) was obtained. Flying that profile, the aircraft reached 36,000 ft (11,000 m) in under three minutes.
Up to 88,000 feet
The records show that Hale also climbed to 88,000 ft (27,000 m) in his Lightning F.3 XR749.
An interceptor tied to its range
The programme began in 1947, when Petter put forward his proposal to the Ministry of Supply and specification ER.103 was issued in response for a single research aircraft. Once in service, the Lightning's performance and its initially limited fuel supply meant that its missions were largely dictated by its short range. In 1985, as part of the agreement to sell the Panavia Tornado to the RSAF, the 22 airworthy Lightnings were handed over in exchange to British Aerospace and returned to Warton in January 1986. The Lightning's direct replacement was the Panavia Tornado F3, the interceptor variant of the multirole Panavia Tornado.
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