YORG.io multiplayer is a fun place to be. Most multiplayer rounds last around 5-6 minutes on average, more if you are against a decent player. During my time in multiplayer, I was basically insane, reaching insane levels of craziness, such as summoning many zombies, spawning only 1 zombie, reaching level 10 Zombie Spawner, and focusing heavily on crystal production rather than defence (except walls). I had a little too much fun whilst playing the multiplayer and will eventually return to it soon.
Discord: / discord
Music from Epidemic Sound (http://www.epidemicsound.com)