Not bad at all as a timeframe, but seeing that the Anna update took 3-4 weeks until everyone got it, we will probably be going through the Belle process throughout the good part of February still. Not that a lot of people didn't install the unofficial Belle already, but being legit is a whole different feeling.
In any case, your trusted old N8, which 15 months after release still consistently scores at the top of camera comparisons, will finally also get a zippy and functional interface to round it off. For more info, you can read thorough Belle impressions, along with a video demo, in our review of the Nokia 701.
source: Nokia (Twitter) via GSMArena