So in options there would be a Timer selection area.. where you can pick your preference of how long you would like each of you and your opponents turns to last.. 15 seconds, 20 seconds, or 30 seconds..
I'm not sure what the current settings are.. but I've fought at all 3..
It would be a preference where it searches for your specific time first then it'll search for the rest.. giving you hopefully what you want.. while not making you wait too much longer.. the black mark represents a no preference choice as well.. where you'll just battle at whatever time it doesn't matter to you...
Why have this is to give us the players more control and to have a better experience.. my stuff is slow so I'd want to prefer a 30 second battle.. while someone else might want quick battles of 15 seconds.. this way everyone is happy.. and we don't have to wonder what the hell is going on