If by "day" you mean how long is the sun above the horizon, then the answer is that AT the South Pole there 4380 hours in the "day" and only one "day" in any year.
Mid-winter's Day in most of Antarctica, June 21, is a day without a sunrise. This is also true at the South Pole.
The Southern Hemisphere would be pointed away from the sun in order for the South Pole to experience 24 hours of darkness -- which occurs at the pole every day between about March 21 and September 21.
Zero hours of sunlight. The Winter Solstice on the 21st of June is the day that the sun is furthest away from the South Pole. Sunrise at the South Pole is on about the 21st of September every year. Sunset is on about the 22nd of March the following year. The reverse is the case at the North Pole. So a polar day is about 6 months and a polar night is also about 6 months.
The North Pole is dark for six months- from the September Equinox (September 21) to the March Equinox (March 21).
Britain is in the northern hemisphere, the South Pole is at the dead centre of the southern hemisphere. If Britain is in the middle of its summer, the South Pole will be in the middle of its winter, therefore, the South Pole will be in darkness.
There is one sunrise at the South Pole each year, which occurs about September 21. From then until about March 21, there are 24 hours of daylight every day until the sunsets. This is caused by the Earth's tilt of the Southern Hemisphere toward the Sun.
During summer at the South Pole, which occurs from October to February, the sun remains above the horizon for 24 hours a day due to the tilt of the Earth's axis. This results in continuous daylight and warmer temperatures in the region.
Most of Antarctica is dark for 24 hours a day in June: there are no sunrises during that month. Particularly, at the South Pole, the sun rises on about the 21st of September every year. Sunset is on about the 22nd of March the following year.
That is true of the North Pole, where the day lasts from March through September, and the South Pole, where the day lasts from September through March. Everywhere on Earth north of the Arctic Circle and south of the Antarctic Circle has at least one day per year of 24 hours of sun exposure and one day per year without direct sunlight.
The time of day is essentially immaterial, since there were no time zones at the South Pole.
If you are at exactly the north or south pole the measurement is in Revolutions per Day And that speed is 1 Revolution Per Day.
On June 21, the South Pole experiences a phenomenon known as the polar day, where the sun remains continuously above the horizon, resulting in 24 hours of daylight. This is because of the tilt of the Earth's axis, causing the sun to circle the sky without setting.