i had my stamps translated by a professional firm who took copies of the pages with stamps and put their stamp on it certifying that this is what was translated. I then took the copy of that document and sent it along with my RQ
I had RQ and just got my citizenship couple of weeks ago. The whole thing took about 30 months for me.. Maybe it depends how strong your RQ evidence is
Applied in July 2011
Got my invitation for the test (ST Clair) in August 2012 and received RQ during the test
Oath invitation - February 2014
So definitely less than 35 months (what they quote on their website)