Here is the first occurance: http://www.dumpalink.com/media/1145694424/How_Long_Can_You_Last
The tune in it's full length: http://www.tvfolk.net/artistVideo.php?ID=420&resolution=high (requires QT)
Here is the lyrics: http://www.noside.com/nsd6010note.html
The group perfoming it is Loituma and the song is Levan Polkaa. Catchy?
I have the short version as ringtone on my cellphone.