errore query

[TittyMail]

Fatal error: Maximum execution time of 30 seconds exceeded in
uhm :master:

<?
$count = mysql_query("SELECT COUNT(IdChiamata) FROM Call");                            
                            $res_count = mysql_fetch_row($count);                                        
                            
                            $tot_records = $res_count[0];
                            
                            $per_page = 20;
                        
                            $tot_pages = ceil($tot_records / $per_page);
                        
                            $current_page = (!$_GET['page']) ? 1 : (int)$_GET['page'];
                        
                            $primo = ($current_page - 1) * $per_page;                                    
while(list($c, $v)=each($ris)) {
                                    $MatrCall = $v["Matricola"];                                                                    
                                    if($MatrCall<>$MatrCallOld){                                    
                                        $MatrCallOld = $MatrCall;                                        
                                        $arrMatr[] = $MatrCallOld;                                
                                    }
                                    $arrMatrUt[] = $MatrCall;                                                        
                                }    
                                for($i=0; $i < count($arrMatrUt); $i++){
                                    $MatrCall = $arrMatrUt[$i];    
  $query_limit = mysql_query("SELECT Id,Matricola,Nominativo,Telefono,Mail,Sede FROM Utenti WHERE Matricola = '".$MatrCall."'LIMIT $primo, $per_page");
                                while($row=mysql_fetch_array($query_limit)){    
                                    $cont = $cont +1;
                                        $id = $row["Id"];
                                        $Matr = $row["Matricola"];                                                                    
                                        $Nom = $row["Nominativo"];
                                        $Tel = $row["Telefono"]; 
                                        $Mail = $row["Mail"]; 
                                        $Sede = $row["Sede"];                                    
                                        $MatrOld=$Matr;    
}
?>