Antarctic summer is the busiest season on the continent.
Nobody lives in Antarctica except for a few scientific study bases, where people only stay for about a year at a time.
Each research station bases its time clocks in the country that supports the station. There is no standard time in Antarctica.
Antarctica is home only to scientists, and for short periods of time. These scientists live in the "bases" developed by their countries.
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It is extremely too cold for most people to survive in Antarctica, however, it is not impossible. It is the only continent not owned by any specific government, and anyone can go there. However, most people do not because it is below freezing all of the time. Very few vegetation and animal life grow there, thus, food is hard to come by.
No, Antarctica does not observe Daylight Saving Time. The continent's population is primarily made up of scientific researchers and support staff who typically adhere to the time zone of their home country or base station.
Before what time period? No people have never lived in Antarctica. Scientists go on expeditions there but don't stay for more than a few months.
Visiting Antarctica implies that you are a tourist. Most tours to Antarctica take place when the sea ice has melted, usually between about October and about February, depending on the year.
Since Antarctica is 'discovered' by every first-time visitor, the answer to your question is tens of thousands of times, since that's the number of people who have visited Antarctica in history.
In Antarctica, there is no logic time so this can not be known.
There are major blizzards most all of the time on the Antarctic continent.
Scientists are measuring the ice cap and looking at the what the atmosphere was like a long time ago.