How long has this bottle been open?
'Aperta' — stress on 'a-PÈR-ta'. Three syllables. Feminine form agreeing with 'bottiglia'.
Ask in a wine bar or tasting room when you want to know how long a bottle has been open — relevant for wine quality, especially for delicate whites.
'Da quanto tempo è aperta?' = 'how long has it been open?' The 'da' with present tense indicates duration of an ongoing situation.
È aperta da oggi?
Has it been open since today?
Ask if it was opened fresh this day
Quante ore fa è stata aperta?
How many hours ago was it opened?
More precise version asking for hours
Il vino è ancora fresco?
Is the wine still fresh?
Asks for quality assessment rather than time
Falanghina from Campania is one of Italy's most resilient white wines. Italian wine bars use vacuum pumps ('pompe ad estrazione') to preserve open bottles.