How long does the sting from a jellyfish last?
30 minutes or an hour
If you get a jellyfish sting, put ice on the jellyfish to control the pain. Pour vinegar on the sting of the jellyfish, unless the sting came from a blue bottle jellyfish. Wash the sting with warm water or cold water, and slowly remove the tentacles with gloves or a towel rather than your barehands. Keep in mind that the next time you visit a beach with blue bottle jellyfish, do not touch any jellyfish…
It depends on the Jellyfish, if it's a baby or if it's small about twenty minutes not long. If it's a big adult... you may need to go to the hospital because of their poison or it could be no big deal and it would last about a hour. Warning! The size doesn't always count! Becareful and safe! Hopes this helps!