Actually, in terms of trip distance LGW to Malabo / Equatorial Guinea ( SSG / FGSL ) is even further, i.e. 2879 Nm and is typically in the region of 7 hours non-stop ( albeit flown with usually a light'ish passenger load ).
That said, Malabo is far enough away that when you arrive you have to get off the aircraft and get your head down in a local hotel for a few hours ( which is something of a dubious pleasure
).