From 747 FCTM -
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For optimum takeoff and initial climb performance, initiate a smooth continuous rotation between 2 to 3º/second at VR to the rotation attitude. At light gross weights, the airplane accelerates rapidly and the rotation rate will be faster than at heavy gross weights.
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The total time to rotate from VR to the rotation attitude will take 6 seconds with all engines operating, and 9 seconds for 3 engines operating.
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Aft fuselage contact ("tail strike") on all 747 (except SP) will occur at 12.5º of pitch attitude with the wheels on runway and gear struts fully extended. Using flaps 20 rather than flaps 10 for takeoff reduces risk of tail strikes.
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Happy contrails