On all beers you should transfer to the secondary when you have reached the final gravity. You can aquire off flavors (some minor, some not) if you leave the beer on the sediment too long. You want the beer to taste it's optimal best.
There is also no real need to leave the beer in the secondary for a long time either. Bottle once the beer is clear (if it doesn't clear within 10 days transfer again to get rid of the sediment, and let set another week). Beers that are this big do need to age for extra time. The beer can condition in the bottles or keg away from all of the sediment.