A total melting of Antarctica is possible, but would take a minimum of 500 years, and quite possibly much longer (thousands of years), though major thresholds such as critical ice shelves melting (and causing sea-level rises of 3+ metres) could occur within decades.
<https://www.discovermagazine.com/environment/will-antarctica...>
<https://www.nationalgeographic.com/environment/article/antar...>