[CalvinC]

Check if OnPlayerUpdate isn't called by doing so:

pawn Код:

public OnPlayerUpdate(playerid)
{
    Update[playerid] = GetTickCount();
}

And in your timer to increase the players playtime:

pawn Код:

if(GetTickCount() > (Update[i] + 500)) return 1;

Thereby you can detect if the player is AFK.