KEK
https://www.washingtonpost.com/opinions/2019/01/21/mistaken-fox-news-graphic-suggested-ruth-bader-ginsburg-is-dead/?noredirect=on&utm_term=.c8f69b581009
The longest SCOTUS "leave of absense" was 1 year.. ONE YEAR…
Justice Robert Jackson took a year long leave of absence to serve as the chief prosecutor of the Nuremberg trials in 1945-1946.
Renquist was only gone 3 months. After missing 44 oral arguments before the Court in late 2004 and early 2005, Rehnquist appeared on the bench again on March 21, 2005. During his absence, however, he remained involved in the business of the Court, participating in many of the decisions and deliberations