Well according to Eric, they only update once or twice a day. :) I will let you two fight that out.
All I know is that there is an 12-24 hour delay between the time I post an article and it shows up in the the Reader. (either on WordPress.com or on my iPad Air) I know the feed is updating properly so this is something going on the WordPress.com side of things.
I will gladly help test this in any way you would like me to. I don't like that my wordpress.com followers who are using Reader to read my blog are getting "old" news.
Thanks for your help on this problem and the "other" problem that is still not resolved. (comment notification being attached to the wrong post)