I assume that when an archive MP3 is shorter than the 30 minute span, it's probably due to a feed outages and that makes sense.  But I'm curious as to why sometimes the archive MP3's are longer than 30 minutes, such as 48 minutes?  Also, in such a case, will the audio at the beginning of the file be from the start time and the extra at the end be part of the next half hour period?
I'm a big fan, and donated again just now.  Keep up the great work!