Catering
Not easy but....but my interpretation of what you might be looking for.
Large aircraft:
Flight times 4:30hrs each way with one hour at start and approx one hour transit equalls 11hrs total time with return leg full service catering carried.
Aircraft chillers are a reliability factor to ensure food remains at a given cold temperature.
Overnight aircraft is de-catered due time and heat.
Approx 15-20 minutes to load single sector catering for full meal service prior to departure of 4:30hrs sector.
Cabin crew will then fine tune for special meals or extras that might be required if time available for catering company.
TW