I dump articles into instapaper send them to my kindle when there's a pile of them. That's usually every week. Then, when I have some free time, waiting for my beef stew, for instance, I'll chip at them little by little.

Some really short ones --- a short news for instance, I just skim over them when I see them.

Some articles require more concentration, and I'll usually add them to my At-Desk to do list. When I'm at my desk, and has a chunk of free time, I'll pick one and read.

One thing is that over the week, some articles will have the same topic, with varying depth and quality. So by waiting a little bit, I can often read less words while still being informed.

But I probably spend much more time on books, mostly in mornings and evenings, because I prefer books in general. However, I read fictions most of the time. It's probably not what you have in mind, and it isn't really comparable to articles.