Larry,

They set a distance record, not endurance. QANTAS still holds the
endurance record for a nonstop airline flight. During WWII QANTAS ran
twice a week scheduled service from Australia to Sri Lanka in a PBY.
The flight lasted as long as 36 hours nonstop, unrefueled. Pax got a
"double sunrise" certificate upon arrival at the destination.

All the best,
Rick