<prompt> Half life of factor VIII -2-4 hours8-12 hours6 minutes60 days  <response>: Ans. is b i.e., 8-12 hours o Half life of various clotting factors in hours :- Firinogen - 100-150 Factor III -6 Factor X - 45-52 Prothrombin -60 FactorVIII-8-12 FactorXI -48-84 Factor V-24 Factor IX - 24 Factor XII - 150 WVF-30 