Appreciating Download Time

uses Math

TDRec = record
  H, M, S: Integer;
  end;

const
  Count = 6;
  BpsArray: array [0..Count] of Integer = (14400,
    28800,
    33600,
    56000,
    64000,
    128000,
    512000
    );
    
//

function CalculateDLTime(const Value, Units, Connection: Integer): TDRec;
var
  i, size_bits, filedltimesec, hourmod, HH, MM, SS: Integer;

  Rec: TDRec;

  function pow(a, b: Integer): Integer;
    function sl(nr, times: Integer): Integer;
    var
      i: Integer;
    begin
      Result := nr * nr;
      for i := 0 to times do Result := Result + nr * nr;
    end;
  begin
    if a > b then Result := sl(a, b)
    else 
      Result := sl(b, a);
  end;
begin
  case Units of
    1: size_bits := (8 div 1) * Value;                 // bytes
    2: size_bits := (8 div 1) * ((pow(2,10)) div 1) * Value;     // kilobytes
    3: size_bits := (8 div 1) * ((pow(2,20)) div 1) * Value;     // Megabytes
  end;

  // Calculate
  filedltimesec := Round(size_bits) div BpsArray[Connection];

  hourmod := filedltimesec mod (60 * 60);  // Modulus.
  HH      := Floor(filedltimesec / (60 * 60));
  MM      := Floor(hourmod / 60);
  SS      := Floor(filedltimesec mod 60);  // Modulus.

  if SS > 0 then Inc(SS);

  with Rec do
  begin
    H := HH;
    M := MM;
    S := SS;
  end;

  Result := Rec;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
  Rec: TDRec;
  NameArray: array [1..100] of Char;
begin
  ListView1.Items.Clear;

  for i := 0 to Count do
  begin
    Rec := CalculateDLTime(StrToInt(Edit1.Text), ComboBox1.ItemIndex + 1,i);

    with ListView1.Items.Add do
    begin
      Caption := NameArray[i];
      SubItems.Add(IntToStr(Rec.H));
      SubItems.Add(IntToStr(Rec.M));
      SubItems.Add(IntToStr(Rec.S));
    end;
  end;
end;