I'm using the Radio Userland add-on tool Kit to read news items. By preference, I read one hour at a time, then cycle backwards an hour until I'm caught up. Reading too many hours at one time is problematic because feeds often contain mismatched HTML tags that hose the font, font size, italics, and the like for all subsequent news items.
I submitted UserTalk code to Kit developer Mark Paschal today that makes it possible to cycle backwards through news items one hour at a time by simply clicking the Show button.
If you're using Kit and would like him to integrate the suggestion, speak now or forever hold your peace. Those who are against the idea have the right to remain silent.