[Code8976Man]

pawn Код:

new afk_timer;

afk_timer = SetTimerEx("estaafk",900000,0,"d",playerid);

KillTimer(afk_timer);

EDIT:

Los timers van con publics, aunque no se si acepta stock.

pawn Код:

forward estaafk(playerid);
public estaafk(playerid)