

The fastest ascent of the top three highest mountains with supplementary oxygen (female) is 1 year 364 days, and was achieved by Viridiana Álvarez Chávez (Mexico) from 16 May 2017 to 15 May 2019.
Viridiana summited the Everest (8,848 m; 29,029 ft) on 16 May 2017, the K2 (8,611 m; 28,251 ft) on 21 July 2018, and the Kangchenjunga (8,586 m; 28,169 ft) on 15 May 2019.