Balloons usually leak for hours.

Ordinary balloons, about 3 days, which is 72 hours.

Blow up the balloon and tie it tightly, then soak your mouth in the fragrant water 1-2 minutes, and then tie it tightly with a rope. This will be as airtight as glue and last at least three months.

It depends on the inflation of the balloon and the approximate length of the weather, sun and wind direction, which can be about 2 ~ 3 days shorter than a week.