The Herc tankers used to hold Q for the F4s/F3s down south. The aircraft would be prepped for a quick start - GTC (APU) on, turn all four, taxi. We's usually be ready for T/O before the fighters, but SOP was for them to go first.
Was once scrambled from Q to rescue an F3 after their tanker had gone US - less than 4 minutes from crewroom to airborne (and ony 2 minutes from arriving at the aircraft).