Is it really asking too much

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It works for World of Warcraft, why wouldn't it work for this game.

In WoW you stay AFK for 20 minutes you get logged out.

its not gonna work because people will just circumvent it. they would make a macro on their gkeys or razer keyboards to press jump then pause 5 min then jump again. to prevent from idling to long. This is why antiafk systems are dumb and pointless.