This is nothing compared to some of the compound words in German, lol!
According to http://europeisnotdead.com/disco/words-of-europe/european-longest-words/ , this is the longest word in the Irish language
They seem to be right, but they don't seem to have noticed that they quote it in the genitive case, which adds an -a to the end. http://breis.focloir.ie/en/fgb/grianghrafad%C3%B3ireacht
You can hear grianghrafadóireacht here:
Note that the pronunciation database at teanglann.ie doesn't include the definite article, or the lenition that it would cause in this feminine word.