▁tradition ally ▁scheduled ▁in ▁the ▁afternoon , ▁while ▁the ▁C oca - Col a ▁ 6 0 0 ▁at ▁Charlotte ▁Motor ▁Speed way ▁is ▁held ▁as ▁a ▁night ▁race . ▁Since ▁the ▁events ▁are ▁not ▁scheduled ▁to ▁overlap , ▁this ▁allows ▁a ▁driver ▁a ▁small ▁window ▁to ▁travel ▁between ▁ven ues . ▁ ▁Such ▁an ▁accomplish ment ▁can ▁be ▁gru eling ▁and ▁phys ically ▁exhaust ing . ▁It ▁calls ▁for ▁a ▁driver ▁to ▁race ▁for ▁over ▁seven ▁hours ▁in ▁two ▁entirely ▁different ▁discipl ines ▁of ▁racing ▁cars . ▁Al ong ▁with ▁a ▁ 4 3 0 - mile ▁air plane ▁flight ▁and ▁severe ▁time ▁constraints , ▁the ▁driver ▁has ▁time ▁for ▁only ▁a ▁brief ▁rest ▁ab o ard ▁the ▁aircraft ▁where ▁they ▁normally ▁take ▁on ▁IV ▁flu ids , ▁and ▁are ▁checked ▁out ▁by ▁a ▁phys ician . ▁ ▁We ather ▁plays ▁a ▁significant ▁factor ▁in ▁the ▁log istics ▁of ▁" Double ▁D ut y ". ▁If ▁weather ▁co oper ates ▁and ▁there ▁is ▁no ▁rain ▁at ▁either ▁ven ue , ▁del ays ▁are ▁usually ▁minimal . ▁However , ▁if ▁rain ▁del ays ▁one ▁of ▁the ▁races ▁( part icular ly ▁Indian apolis ), ▁it ▁can ▁significantly ▁dis rupt ▁or ▁completely ▁cancel ▁the ▁opportunity ▁for ▁the ▁attempt . ▁ ▁According ▁to ▁NAS C AR ▁rules ▁all ▁drivers ▁are ▁required , ▁without ▁exception , ▁to ▁attend ▁in ▁person ▁the ▁pre - race ▁drivers ' ▁meeting ▁or ▁suffer ▁a ▁grid ▁penalty . ▁If ▁a ▁driver ▁miss es ▁the ▁meeting ▁for ▁any ▁reason , ▁they ▁are