Just a couple of comments:

• WHERE calendar_desc = '$voy_cal2use': http://www.bobby-tables.com. Use What are placeholders in DBI, and why would I want to use them? instead.
• I could not find a declaration for $voy_cal2use.
• There is a lot of duplicated code. Quite a bit could be reduced by generating part of the SQL:

  my $column_names = join( ",", map {
      ( "${_}_open", "${_}_openhour", "${_}_closehour" );
  } map {
      lc( $_ );
  } @day_text;
  
  my $sql = qq(SELECT $column_names ...);
  [download]

• I would probably use a slightly different data structure and leverage the bind_col or bind_columns call from DBI instead of the block of $normal_hrs{$day}{$subkey} = ... calls.

No time yet to evaluate other things.

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