How many rounds to win?

In R6, a standard ranked match is first to 4 rounds in overtime and first to 7 in regular play (Best of 12 rounds). If both teams reach 6-6, overtime is played in some modes

If you're playing Unranked or Quick Match, the round count is shorter, usually Best of 5 (first to 3 wins). For Ranked, it’s Best of 12 (first to 7 wins, or overtime in some cases)

the more the better as long as your teammates don't disconnect