DD has used the low end adverbs such as never, almost, nearly, only, not, afterwards forever (I couldn't even tell you exactly when she started but before she was 2). But she also uses more complicated ones such as accidentally, never, often, and terribly.
What started this whole thing was it was past her bed time so I told her it was late and she needed to change into her pajamas. And she responded with 'But it isn't terribly late.'
And for what it's worth my 29 DD actually does say 'eventually' a lot.
But after posting the question I continued to look and did come across the site showing 60 mths which yes interesting list but also some state guidelines for Kindergarten curriculum and during the second half of the year they work on adverbs. So I think the 60 mths list might be more accurate but they should start using some around 3.
Thanks for looking chris.