@mrmqmen: As I said, the complete set of metadata and the many people listening to the shortened clips explain the wrong runtimes being picked up by lastfm, i for one got the full version ^^
The durations match up perfectly with the excerpts that can be listened to (and also, although obviously not intended that way, quite easyly downloaded from) his website, which also already contain perfectly fine metadata, which would explain last.fm picking this up ;)