Well, with Genie's intro, I think you have all of "Christmas in Killarney." I can't remember any additional words, and I've checked with quite a few sources...

I think what makes it feel longer is that artists often stick in an instrumental break, and then repeat this song. It's certainly an option!

We had this on a Bing Crosby album when I was growing up, along with "Mele Kalikimaka." (And, as a child, I always wondered *why* 'Mele Kalikimaka' was "the wise way to say Merry Christmas to you!" I didn't think it sounded any wiser than regular ole' Merry Christmas...)
;^)
denise, who KNOWS now!