A couple of months ago, shortly before the summer, it took the Russian Consulate 5 weeks to process my multi entry visa, they were too busy...
It was my fifth in a row, no obstacles, they just couldn't be bothered.
So be anticipating alltough the winterseason might be easier.
And I did it through a agency.
Also, it is not possible anymore to get an entry visa in St Petersburg, only in Moscow (2 months ago)
Be prepared, things seem to take time dealing with Russians...
CK