How long will a bottle of LBV port last?

I will depend both on the age and on the type of LBV:

The older the LBV, the sooner it'll fade.
If it is a filtered LBV (most often bottled after 6 years after the Vintage, it should say so on the label) will last for a week or 2 if you store it in the fridge (think Dow, Graham, Fonseca, Taylor...). Unfiltered / traditional LBVs (bottled after 4 years, and usually closed with a proper cork) won't last that long, but as they are IMHO much more tasty as well, you won\t have a problem finishing the bottle quickly! Some houses that make Traditional LBV: Warre, Noval, Niepoort, Smith Woodhouse, Ramos Pinto. Hope this helps!

Stevie, what are your favorites of the "traditional" producers you mentioned?

In no particular order:

Niepoort '96 and '98
Noval '97
Ramos Pinto '97
Warre '92
Quinta do Crasto '97

I believe TNs on almost all of these have been posted.

stevie-guru,

best info!

traditional = unfiltered + not stabilized
today most = fitered + stabilized

traditional (more like vintage)

today most (more like tawny/ruby)