You can vote unlimited times, and the deadline is every Saturday at 8:00 pm EST / UTC-5 (Sundays at 10:00 am KST / UTC + 9). The poll restarts every Monday around 8:00 pm EST / UTC-5 (Tuesday at 10:00 am KST / UTC + 9)
About the ranking system
To determine the score of the songs in the weekly ranking, the following is taken into account:
1) Votes of listeners (1 to 20 points): the song with the most votes will have 20 points. The song with less votes will have 1 point. The songs are ordered from 1 to 20 according to the number of votes.
2) GAON chart (from 1 to 20 points): the songs will have a bonus of 1 to 20 points, if they are in the most recent weekly GAON ranking.
3) DJ votes (from 1 to 20 points): the DJ will vote for the songs according to the quality criteria. A score from 1 to 20 will be assigned to each song.
Final score = 80% x listener votes + 10% x GAON ranking + 10% x DJ votes.