how to set 3 mins. time?

[khenma 1]

-	script	Finding NPC	757,{	OnInit:	set .itemid,7539;	set .quantity,70;	end;	OnWhisperGlobal:	if( getgmlevel() < 80 ) end;OnClock0130:OnClock0300:OnClock0430:OnClock0600:OnClock0730:OnClock0900:OnClock1030:OnClock1200:OnClock1330:OnClock1500:OnClock1630:OnClock1800:OnClock1930:OnClock2100:OnClock2230:	set .spawn,rand(1,50);	set .mob,rand(1078,1085);	killmonster .maps$[.s],"All";	// -- You can add or chance maps and IDs with a maximum of 127 each.    	setarray .maps$[0],"prontera","geffen","payon","alberta","morocc","aldebaran","izlude","comodo","umbala","yuno","hugel","rachel","veins","einbroch";	set .s,rand(getarraysize(.maps$));        	monster .maps$[.s],0,0,"Plz don't kill me!",.mob,.spawn,strnpcinfo(0)+"::OnMobKilled";	// -- Message to Announce when Event start	setarray .message$[0],"Total of "+.spawn+" "+getmonsterinfo(.mob,0)+" has been Spawned in map "+strtoupper(.maps$[.s]),	"Find all the "+getmonsterinfo(.mob,0)+" and kill it","Every single "+getmonsterinfo(.mob,0)+" you will will gain you "+.quantity+" x "+getitemname( .itemid ),	"Hurry up and go now";    	for( set .i,0; .i < getarraysize( .message$ ); set .i,.i + 1 )	{    	announce .message$[.i],0;	sleep 1000;    	}	end;OnMobKilled:	set .spawn,.spawn-1;	getitem .itemid,.quantity;    	if( .spawn )    announce "[ "+strcharinfo(0)+" ] Killed 1 "+getmonsterinfo(.mob,0)+", Left "+.spawn+" "+getmonsterinfo(.mob,0)+"",bc_map;    else	announce "Event End, all the "+getmonsterinfo(.mob,0)+" has been Killed.",bc_map;	OnTimer60000:	killmonster ".maps$[.s]","All";	atcommand "@killmonster2";	end;	}

Please check line 52 -54,

please help me to make this to have a count down of 3 minutes, 3 minutes countdown should be trigger only when 1 monster has been killed. even though all summoned monster has not been killed yet the event should be ended.

I tried my best, but still no luck..

Thanks.

 

[N e s s 3]

1000 = 1 sec

1000 x 60 = 60000 (1min)

60000 x 3 = 180000 (3mins)