help with this script

[GM Chris]

sorry a newbie here, can anyone tell me how to edit this script to make the event run every 4 hours? thank you so much

prontera,156,157,5 script Counting Game 437,{
mes "This is a Monsters Counting Game";
mes "I will summon some Monsters here, and you have to count the Correct Amount of Monsters i summoned.";
mes "^FF0000Only Count for the Monsters i mentioned^000000";
next;
switch( select( "Information",
( getgmlevel() < .GMLevel || .Event )?"":"^FF0000[GM]^000000 Start Game",
( getgmlevel() < .GMLevel || !.Event )?"":"^FF0000[GM]^000000 End Game" )){

Case 1:
mes "When the Event Start, i will summon some Monsters at a small area, and players have to count the amount of the flowers.";
mes "Whoever tell me the correct amount of Monsters i mentioned, he/she win the game.";
break;

Case 2:
mes "Event will begin right now.";
close2;
donpcevent strnpcinfo(0)+"::OnStartGame";
end;
Case 3:
set .Event,0;
set .Round,0;
deletepset 1;
delwaitingroom;
set .Winner[0],0;
set .Winner[1],0;
npctalk "Counting Game Cancelled.";
killmonster .Map$,"All";
mes "Game Cancelled.";
break;
}
close;
OnSpammed:
set @Spam,0;
end;

iSpam:
if( getgmlevel() > 90 ) end;
set @Spam,@Spam + 1;
if( @Spam >= .Spam ){ // 3 Continuos Answer will trigger...
 set @SpamDelay,gettimetick(2) + .Spam;
 dispbottom "SPAM Detected, your answer within next "+.Spam+" Seconds will be Ignored.";
}
deltimer strnpcinfo(0)+"::OnSpammed";
addtimer ( .Spam * 1000 ),strnpcinfo(0)+"::OnSpammed";
end;

iRight:
set @Spam,0;
deltimer strnpcinfo(0)+"::OnSpammed";
if( !.Event ){
message strcharinfo(0),"Sorry, there is no Event right now.";
}else if( @SpamDelay > gettimetick(2) ){
message strcharinfo(0),"SPAM Protection : Remain "+( @SpamDelay - gettimetick(2) )+" seconds.";
}else if( getcharid(0) == .Winner[0] && gettimetick(2) < .Winner[1] ){
message strcharinfo(0),"Sorry, Winner Time Penalty : Remain "+( .Winner[1] - gettimetick(2) )+" seconds.";
}else{
delwaitingroom;
set .Event,0;
set .Round,.Round - 1;
set .Winner[0],getcharid(0);
set .Winner[1],gettimetick(2) + .Delay;
npctalk "[ "+strcharinfo(0)+" ] , You're Correct.";
killmonster .Map$,"All";
deletepset 1;
if( getarraysize( .Reward$ ) > 1 )
 for( set .@i,0; .@i < getarraysize( .Reward$ ) - 1; set .@i,.@i + 2 )
  if( getitemname( atoi( .Reward$[.@i] ) ) == "null" ){
set getd( .Reward$[.@i] ),getd( .Reward$[.@i] ) + atoi( .Reward$[.@i+1] );
dispbottom "Reward : "+.Reward$[.@i]+" + "+.Reward$[.@i+1];
  }else{
getitem atoi( .Reward$[.@i] ),atoi( .Reward$[.@i+1] );
dispbottom "Reward : "+getitemname( atoi( .Reward$[.@i] ) )+" x "+.Reward$[.@i+1];
  }
if( .Round ) donpcevent strnpcinfo(0)+"::OnStartGame";
}
end;

OnInit:
// Min. GM Level to access GM Panel
set .GMLevel,80;
// Game Location
set .Map$,"prontera";
// Monster ID Lists
setarray .MonsterList[0],1084,1085;
// Winners Answer Delay ( Not advised for High Value )
set .Delay,10;
// Spam Prevention ( Not advised for High Value )
set .Spam,3;
// How many rounds
set .MaxRound,10;
// Area Coordination <x1>,<y1>,<x2>,<y2>;
setarray .Coordinate,153,146,159,153;
// Rewards ...
setarray .Reward$[0],
  "#CASHPOINTS","5",
  "Zeny","10000",
 // "7227","1",
 // "CustomVariable","100000",
 // "#CustomVariable","100000",
  "7227","1";
end;

OnMinute30:
for( set .@i,60; .@i > 0; set .@i,.@i - 10 ){
announce "Flower Counting Game : start within "+.@i+" Seconds in "+.Map$,0;
sleep 10000;
}
OnStartGame:
if( !.Round ) set .Round,.MaxRound;
announce "Counting Game has started in "+.Map$,0;
deletearray .MobCount[0],getarraysize( .MobCount );
for( set .@x,.Coordinate[0]; .@x <= .Coordinate[2]; set .@x,.@x + 1 )
 for( set .@y,.Coordinate[1]; .@y <= .Coordinate[3]; set .@y,.@y + 1 ){
  set .@Summon,rand( getarraysize( .MonsterList ) );
  monster .Map$,.@x,.@y,"Count Me",.MonsterList[.@Summon],1,strnpcinfo(0)+"::OnKilled";
  set .MobCount[.@Summon],.MobCount[.@Summon] + 1;
  sleep2 1;
 }
set .@Target,rand( getarraysize( .MonsterList ) );
deletepset 1;
defpattern 1, "([^:]+): (\\|\\d{2})?"+.MobCount[.@Target]+ ".$", "iRight";
// defpattern 1,"([^:]+): "+.MobCount[.@Target], "iRight";
defpattern 1,"([^:]+):.*.*", "iSpam";
activatepset 1;
delwaitingroom;
waitingroom getmonsterinfo( .MonsterList[.@Target],0 ),0;
npctalk "Count for the Targeted Monster's Amount to Win the Game.";
set .Event,1;
end;

OnKilled:
mes "You will be punished upon killing these Monsters and interupt the Game.";
set @Spam,30;
close2;
npctalk "Round Restarted due to interruption.";
donpcevent strnpcinfo(0)+"::OnStartGame";
end;
}

Edited December 11, 2012 by Emistry
Please use [CODEBOX] or Attachments for long contents.

[Emistry]

change

OnMinute30:

to

OnClock0030:
OnClock0430:
OnClock0830:
OnClock1230:
OnClock1630:

[GM Chris]

Thank you!