Dirt something and count the rounds.
edit: Let me rephrase that. Dirt something, wait for it to rub out, dirt again and count the rounds between the dirt and rubbing out again. I know it's about that long because when I train a 2 round lag skill, I usually dirt, spam it three times, then switch to another screen, switch back for the last hit of the skill, then spam where/who pk/who gr.
viri said that a tick is on average about 8 rounds...I usually sleep after 6.
Well, I can't test it right now, at the gf's house, but I'll post a log, proving me right or wrong.
Wrong. A tick is about thirty seconds. A combat round is about eight seconds.
I like this game.
You're trying to tell me dirt only lasts for 4 rounds, max?
....
I thought that a combat round is every round of attacks exchanged between each other. Couple of seconds between rounds. 8 seconds is way too much time between combat rounds, but way less than a tick. What the hell is that 8 seconds in reference to?
Dey
I wasn't trying to tell you anything. 
But a round is actually about 4 seconds.
I lied.
If by lied, you mean you were wrong by approximately 100%...
Then yeah, you lied.
a combat round is about 3 seconds IRL, meaning, 30 seconds IRL (a tick) is about 10 combat rounds.