I drink port only in restaurants, but yesterday got a great deal on a bottle of Quinta do Portal 2000 Vintage Port so decided to go for it. How long will this be good for after opening? My wife doesn't drink port, so it will be just me. Is it OK to open and recork? It will take me a few weeks to go through a bottle. Or should I wait until some night when we have guests and drink it in one night?