They last about a month and can be seen about every 30 earth years.
i think the great white spot lasts approximately a year.
Jupiter has had a great red spot for as long as telescopes have been trained on it - i.e., for at least the last 400 years. The great red spot (which is a storm) seems to be disappearing, though.
The Great White Spot shows up on Saturn about every 30 Earth years and it always looks like a bright spot of light. The Great White Spot only lasts about a month though so it's something not to be missed.
the red dot of jupiter is in fact a giant storm that has been raging for the last 300 years
The "Great Red Spot" that you are referring to is actually on Jupiter. The red spot is a violent storm that has been raging for at least 400 years. Neptune is known to show Great Dark Spots, which are very similar to the great red spot on Jupiter. However, these storms tend to only last a few years.
In 1989, Voyager 2 flew by Neptune and photographed a Great Dark Spot about the size of Earth. Like the Great Red Spot on Jupiter, the Great Dark Spot was probably a giant storm. But the storm didn't last long. Images taken fice years later showed that the Great Dark Spot was gone.
the great red spot is an anti cyclonic storm like a hurricane on earth, but massive. 3 of earth would fit within its boundaries. it has been going on for the last 400 years humans have observed it
No. Neptune is a gas giant, it has no solid surface. Therefore no volcanoes can form on the planet. The Great Dark Spot is an anticyclonic storm, just like the Great Red Spot on Jupiter. Unlike Jupiter's Great Red Spot which has lasted for hundreds (possibly thousands) of years, the Great Dark Spots of Neptune last only a handful of years before vanishing. See the related link below.
yes
It is a huge cloud actually the whole plant is a colorful band of clouds. Scientists say that the giant cloud stays in the same place under the planet's equator and causes disturbances such as whirlpools and wind storms etc. on the planet
They are both large, raging storms last for hundreds of years.
Varies, but we know of one cyclone that's lasted at least 300 years (the red spot).