The destination was Bangkok, not Hong Kong, according to information from
www.procuror.kz. This makes only a slight difference in distance:
EDDV - UAAA: 2739 NM
UAAA - VHHH: 2384 NM
UAAA - VTBD: 2408 NM
All distances are calculated via airway routings.
The total distance is 5123 NM or 5147 NM. This is still a huge distance for a crew of two pilots - during night and without any rest time between the legs.