Green algae will die without water for a few days.

Green algae don't bask in the sun without watering * * If it is green algae, it will die in about three days without watering at all.

If you are exposed to the strong light of the sun, you will usually die in about two days.

The death of green algae is mainly due to strong light and lack of water, which will lead to the failure of biochemical reactions in cells and eventually lead to cell death.

The above contents are for reference only. If you need more relevant information, it is recommended to consult a professional.