The Art of Turning Around an Airplane

That amount of fuel sounds about right. The usual for a jet that size is between 25% and 40% of take off weight.

The turn around included maintenance which isn't always done. And it's quite a big plane requiring more time for boarding and restocking.

If you look at for example easyjet turning around a much smaller airbus A320 for a short haul within the EU, they do it in 25 to 30 minutes.

I think this is a hub turn around, where they do more cleaning and maintenance, which doesn't happen every turn around. I know Lufthansa FRA-DEN-FRA turns that 747 around in Denver in about 2.5 hours.