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Challenges like this can usually be achieved in one sit down of play, so long as the numbers are reasonable, for instance, this one requiring 50 could be done in 10 games if you average 5 kills a game, or only 5 games if you average 10 kills a game, it all depends on your own skill level, Objective gametypes usually help since they have no kill goal, but eventually never seem to end if everybody is only killing, stick to Big team to have your team make progress while you help mow down the enemy