I can't speak to your recipe, but I brewed an imperial nut brown ale at 8.66% ABV, and this is what I did:
Primary for ~4 weeks
Secondary for ~4 months
Bottle for ~3 months before trying the first one.
Incidentally... it was pretty good at 8 months, post brew, but the recipe told me it would be good at six months, great at nine, and amazing at a year. A bottle at a little over nine months was indeed better than the one at eight; I'm pretty much leaving it alone until I hit that year mark.