Japanese phrase
___はどのくらい日持ちしますか？ ___ wa do no ku ra i hi mo chi shi ma su ka
Meaning
How long can ___ be kept?
When to use it
Asks how long a food can be stored. It is a polite question for checking how long something remains usable before its quality declines.
Example dialogue
このパンはどのくらい日持ちしますか？ ko no pa n wa do no ku ra i hi mo chi shi ma su ka
How long can this bread be kept?
常温なら二日くらいです。 jō on na ra futsu ka ku ra i de su
About two days at room temperature.