How long is the direct flight from London Heathrow to Nairobi international Airport?

LHR - NBO nonstop flights
08hr 35min by Bristish Airways Flt 65
08hr 50min by Virgin Atlantic Flt 671
08hr 30min by Kenya Airways Flt 101
Believe it or not, cheapest flight from LHR to NBO is via Mumbai (BOM) by Air India
LHR-BOM Flt AI130 Dep 09:45am 31May,Sun
BOM-NBO Flt AI201 Dep 09:00am 01Jun,Mon
Flight Duration: 15hr 15min; Layover Time: 9hr 30min; Total Trip Time: 24hr 45min