To each his own. I think to have any kind of decent discussion, especially with four or five dudes, it has to be at least an hour. Now Games Radar on the other hand, with their 2 1/2, 3 hour marathons is a bit much.
giant bomb is usually 2 hrs plus.
once you guys get used to doing this, hopefully less talking over each other. i would stick with the hour recording.
no criticisms, after a while you will be giving shit away for free...lol