they are fairly active on NA, like with anything, there are dead hours. id rather not convert to server time, as id probably make an error, so ill opt for hours before and after daily server reset.id say the prime time to do 1v1s are around 2-3 hours before reset and 3-5 hours after it. after then they tend to dwindle down to 1 or 2 pairs of guys fighting non-stop. like with any game mode it can vary in population from time to time and day to day.