A month. Through the query animal encyclopedia information show can be known, which jellyfish do not eat can live for a month, due to the jellyfish body ninety-five percent are water, no water will melt away, must be in the water, is seawater, no can be used sea salt to blend. This kind of thing to live is good to raise, do not have to feed things, but jellyfish are not suitable for living in a small space, can raise 1-2 months is very good.