If you want to go afk in game, find a proper place to be afk and use the cmd /afk. Then you have 20 minuttes to get back from afk (return from afk with typing /afk again) or you get auto kick.
Admins will kick you if you afk in a stupid place like in middle of the road or in middle of RP.
If you are afk without using /afk, the admins have right to kick you from game.