Re:I Learned to Speak Four Languages in a Few Years: Here’s How
by mattmanser on Friday April 20, 2012 @05:08AM
(#3867093)
He mentions right at the start it took longer with Russian.
RTFA.
The US Foreign Service Institute makes estimates for language difficulties for native English speakers, and they seem to be spot on in terms of comparative difficulty—Russian seems to be taking twice as long as French did for me, and they estimate languages like Chinese to take twice as long as Russian.
That said, I still doubt actual fluency is obtainable for non-mavens even in the romance languages. In my experience, all early learners have a naive view of their own ability, no matter what the target language is.