On an Air France CDG-SFO flight back in the 90s we had to put down in Glasgow to off load a passenger with a medical problem.

I seem to recall it taking at most 20 minutes for the 747 to void.

From my port-side window seat I could see the plume of fuel issuing from the wing tip.

Once we got landed the medics had to come on and got the guy off.

Then had to refuel.

Total about 90 minutes delay.

I suspect AF lost money on that flight.