Pursuant to the Digital Millennium Copyright Act (DMCA), all of these archives are available for only 2 weeks and they all run for 5 hours. Unless you want most of the next program, you'll probably want to stop playing the archive at the end of the show you're listening to.
Sometimes the archives fail to record properly due to technical difficulties. If this happens, there will not be an archive available for that week. Sorry for the inconvenience.