It depends on the tournament. You usually add one point to the episode you want to help, and subtract two from an episode you want eliminated. The time varies by tournament. In some you can only vote once every 24 hours, some every 12, and some you can vote after every five posts or so. These are still fairly new; they were introduced by Amanda Hugandkiss in late 2013 to replace the "traditional" tournament style, and now it's pretty much all the Noiseland Arcade is.