How long can a flying doll last once it is full?

The flying doll hydrogen balloon is a lightweight bag-like or bag-like object filled with hydrogen, which is the lightest and has a density of 0.0899 g per liter. It can float up by the buoyancy of hydrogen, 1 dissipates naturally after 5 days.

Flying doll is a new type of toy among network celebrities. It is made of soft silica gel, has induction and glows at night.