increase maxlength on keys to allow for more than 6 keys

Since the feature to allow multiple XML keys per site has been added, I have been creating entries for single pages. Up till today this has been going without a problem on the modules end(just mine). Before today I had one site with 6 XML Keys, and it worked fine.

Today I tried to add two more keys and found that I was unable to add them. When I pasted in the text for XML Key #7, I noticed that only the first two characters showed up in the text entry box. The rest of the XML Key was ignored. I browsed the source for the TLA module and found the area where the XML Keys are input but didn't see any explicit string length limit that I might be hitting (The string maxed out at 130). I haven't used the FORM package before myself, Is it possible that there is a default string length that I am hitting with the textfield?

  function textlinkads_get_keys() {
  $keys = explode(',', variable_get('textlinkads_website_xml_key', ''));
  return $keys; 

   $form['textlinkads_website_xml_key'] = array(
    '#type' => 'textfield',
    '#title' => t('Website XML Keys'),
    '#default_value' => variable_get('textlinkads_website_xml_key', ''),
    '#description' => t('A comma-separated list of keys (no spaces after commas).  You get your XML Site Key from the <a href="http://www.text-link-ads.com/my_account.php?view=my_sites">Get Ad Code page</a> on Text-Link-Ads.com. Each of your site or page within a site has its own code depending on your configuration.  It should look something like this: A4WWSAAOULU1XGHWU78G,A4WWSAAOULU1XGHWU78G.'),
  );