22 hours was my best. BA cancelled my flight and offered to send me back to SYD via HKG (from LHR). It was a family emergency so I assented. Okay, leave eleven hours later.
They neglected to mention that there was an eleven hour wait at HKG as well. I'd have been better off waiting for the next flight via SIN.
LHR-SYD, about 45 hours. Boy, I looked good when I landed.
It didn't matter - by the time I arrived my relative had died. Full marks to the BA lounge in HKG. My gold had dropped out but they let me in anyway. Very sympathetic.
BOFH