I installed autoblog on my wp3.51 test site. I enabled

I installed autoblog on my wp3.51 test site. I enabled a feed. I set it to update every two hours. The next day, it hadn't so I initiated an update. It said the last update was "just now" and next was "in 2 hours".
6 hours later, I log in and see it hasn't updated, says last update 6 hours ago, next one 4 hours ago. Hmmm...

Does this only work when you're in the admin section of the plugin, or should it run as scheduled?