What I was getting at was more the fact that even if you record 3 hours of stuff, you don't need to put the unedited 3 hours out. It can be recorded on a potato microphone on a clay disk for all I care, just spend some time in the edit and cut it down to a manageable size.

There are very few podcasts that can stay on topic and interesting past the 1 - 1.5 hour mark.

The only exception to this rule are the Christopher McQuarrie Spoiler Special episodes of the Empire Podcast (now behind a firewall). The dude can keep spewing fascinating stuff about his movies longer than the movies' combined runtime =)