A woman recently set the record for solo circumnavigation of Antarctica
The time around the continent was 87 days, with another 20ish going to/from port
https://oceannavigator.com/article/lisa-blair-completes-antarctic-circumnavigation/

>>511324075
>how does this prove that you werent just going around in a big circle along the ice wall??
Math
If your "ice wall" map is correct, then the circumference of the 60th degree South parallel would be

>1 degree = 60 nautical miles
>90 degrees to equator, plus 60 to South = 150 degrees = 9,000 nautical miles
>Circumference = 2*pi*r = 56,550 nautical miles
>Travel time = 87 days = 2,088 hours
>Average speed: 27 knots all day every day
A typical racing yacht gets to 13-15 under the best conditions
She was also solo, which means she was only getting 14 hours a day of sailing at best