Get a stopper from Willie Sonoma or some such place. Cover the left over
port with a nitrogen blanket. It will keep in the frig for several
months like that. Don't decant it, even if it old. It doesn't need it.
Cheers,
Kent

al wrote:
>
> I have a nice bottle of Port that I'd quite like a glass of - however, it's
> quite an expensive bottle and I'm the only one who drinks it. Once opened,
> how long should it be kept for? It's a bottle with a cork, not a screw top,
> so difficult for me to re-seal it well.
>
> al