Up to a maximum of 7 or 8 minutes of totality, at any one place.
Depending on circumstances, totality may last anything from a few seconds up to about 8 minutes. 2 or 3 minutes is fairly typical.
There is no actual advantage of a solar eclipse. The sunlight will be blocked for such a little time, that solar power will not be stopped for long.
There were no total solar eclipses during 2007. There was one total lunar eclipse, one partial lunar eclipse, and two partial solar eclipses.
At most 7 minutes. It depends on the eclipse. It can be much shorter than that.
A solar eclipse lasts about 15 minutes
No, a solar eclipse is rare occasion that can only be seen in certain parts of the world when it happens. It isn't a long lasting 'positioning' and it does no harm to the Earth or our atmosphere. A solar eclipse is merely when the Sun, Moon, and Earth align properly so that all of the Sun, but the Corona, is blocked by the Moon. It is a fascinating natural phenomena.
No, your eyes can be permanently damaged if you look at the solar eclipse for too long.
For few seconds
It all depends
2 hours
During a solar eclipse, the moon blocks most of the light coming from the sun to the Earth. This allows an astronomer or anyone to see the remaining with less interference or distraction caused by the overwhelming amount of light normally emitted by the sun. For hundreds of years, astronomers have gone all over teh world to locations where the moon casts it shadow on the Earth so they can view the eclipse. There is a long list of solar features which are possible to observe and study during a solar eclipse, but a common example is the corona, the sun's outer atmosphere. The corona has much structure and can be studied in much greater detail when seen on edge during a solar eclipse.
every 50 years
About 3 minutes!