I was once scheduled to fly AKL-SIN-LHR, the transit in SIN was about two hours which was OK. We were delayed leaving AKL and arrived in SIN with only twenty minutes to go until the flight for LHR departed. With the rigorous gate closure policy at SIN, I assumed I had missed the flight. Not so. I and several others were met at the aircraft door and walked to the next gate where the LHR flight was departing.
I was back in the air twenty three minutes after leaving the flight from AKL.
Never again. Now I deliberately book longer transfers as I find fourteen hours from SIN-LHR, as I’m getting ready to do now enough and I wouldn’t want to do more.