Rappers rap battles and how many rounds would they last thank you?

The Game vs T.I,50cent vs puff daddy,Nicki Minaj vs Lil kim,Nas vs DMX,heavy d vs big pun,drake vs wiz khalfa,snopp dogg vs eminem,dr.dre vs eazy e,ice cube vs LL cool J,beasie boys vs wu tang clan,jay-z vs busta rhymes,lil wayne vs soulja boy,and B.I.G vs tupac,junor mafia vs young money