Not long in my house but it can stay open for weeks without ill effects to the wine or to you.
How long does harry hornes custard powder last when can is opened
Scotch that has been opened will last indefinitely if kept in a cool dark place.
In general, tawny port will last longer once open than ruby port. The tawny port is aged in wood casks for many years which allows a slow oxidation of the wine will aging which in turn provides the wine with a greater strength and structure for aging. Unlike tawny, ruby port is aged for only a short amount of time in oak, thus not giving it the lighter "tawny" color from the oxidation process achieved by extensive time in barrels. The 1994 vintage is a strong vintage in Porto and that particular vintage port can last for decades in the bottle, unopened. Generally, after opening, if abiding by Portuguese custom, the entire bottle of ruby port should be consumed in one night, however if this is not possible, the bottle will likely last for a few more days at near excellent drinking stages, and will then continue to deteriorate thereafter.
About three days.
indefinite
Once opened, it should be refrigerated. Then it can last 2-3 months.
talking to some people, it seems to last around 3 years
4 weeks
Baked beans can last in a fridge for about five days. Baked beans can last in a freezer for about a year.
Depending on whether you want to know about a tawny Port or a ruby Port, it can last anywhere from a week to a month after opening. Ports are made in two main styles: wood-aged or bottle-aged. Wood aged Ports are drinkable once they hit the store and last for about a month once opened. Bottle-aged Ports have a longer aging time before they are marketable and once they are opened only last about a week. Ruby Port is both bottle-aged and wood-aged and tawny Port is wood-aged only so a ruby Port would last only a week once opened and a tawny Port would last about a month.
Till it goes mouldy
It should last for about 6-8 months once opened.