I am gradually building up the number of RSS feeds I keep track of, currently using Bloglines because it’s an online aggregator, so I can access the same content from both work and home and keep track of it in one place. It also allows for decent categorisation of feeds.
One of the FAQs on the Bloglines site is How Many News Feeds Do Most People Track?, which is answered:
The average Bloglines user tracks more than 20 news feeds. The most we’ve ever heard of is 1,400 news feeds. Not everybody has the stamina for that amount of information…
How many feeds are you actively tracking, and on what kinds of subjects? How often do you check for updated posts, or do you have new items ‘pinging’ on your desktop?
I am currently tracking 122 feeds, with categories including Animation, Business, Charities, Education, Environment, Ethics, Faith, Human Rights, IT, Media, Personal blogs, Science, Technology, Weird, and Writing. I also take advantage of Bloglines search feeds which match specific words and phrases to blogs ‘on the fly’. I tend to scan headlines every 1-2 hours during the day.