Sorry for the delayed notifications (Fixed now)
We’re still making improvements to our notifications system. This is the system that sends you updates on new comments and allows you to respond to them. We know it’s a very heavily used feature and a crucial piece to the Disqus experience.
While making these improvements, we ran into some issues which caused notification emails to be delayed by hours. It’s just about all caught up now, but I just wanted to say that we’re sorry about this. We’re working hard to make sure this important feature always works well and on time.
More: continued here