Months with no sunset can range from late October to late February -- depending on where you are on the continent.
Generally, the sunniest season in Antarctica is summer, which is true everywhere on Earth.
The only desert that would have 21 hours of sunlight would be Antarctica during the summer months.
No, you'd have 24 hours of sunlight.
the Equator
It takes 30 hours to get to Australia, and Antarctica is slightly further away, so I would estimate the figure to be around 40 hours.
Antarctica, where there would be zero hours of daylight. Anyplace south of the equator will have less than 12 hours of sunlight, and the farther south, the less daylight you will have in late June. June 21 is the Summer Solstice in the northern hemisphere, and the winter solstice in the southern hemisphere.
Antarctica
The flight would be 21 hours long.
Antarctica is too cold and dry for agriculture or for growing anything. Within a few hours, the cactus would freeze.
47 hours
Depending on the month. If it's 30-days-based month, then it would be 37/30, which is 1.23333333.... hours per day.
Yes, some part of the planet Jupiter is always in sunlight, although very little sunlight is able to penetrate past the upper cloud level. Jupiter has a day length of 9.84 hours. On the equator, 4.92 hours would be spent in light and 4.92 hours would be spent in darkness.
7 DAYS