On line #73, there is a 5,000 limit.
Bing is telling me their limits are 10,000.
$content = json_encode($requestBody);
if (strlen($content) > 5000) {
// we need to check for limited error.
$this->setError(JText::_("EXCEEDED_LIMIT_CHARACTERS").' : '.strlen($content));
return false;
Are you aware of this?