Our case was under administrative processing for 5 months. But I don't know if that is the same as administrative review. They had everything and they told us to just wait. 5 months later we were asked to bring in the passport. Just be patient. This is the hardest part ever!
We've been in this black hole since Jan-15! Ugh.... Went 3-weeks with no status update change, then FINALLY it changed this week but we r still in admin review. Nothing was asked from us, they just needed to verify a document which was verified one week ago........... This totally sucks. We did contact our congressman last week as well but they can take up to 30-days to assist. So, with any luck we'll hear something soon. 64-days and counting now. :-(
