When Adam became the first American Idol contestant ever to return as a mentor, it was for the Elvis-themed week of American Idol Season 9 on April 13, 2010.
During the QUEEN + Adam Lambert 2018 Las Vegas Residency "The Crown Jewels", Adam performed another Elvis cover - "Heartbreak Hotel". Visit the Essential Covers page to check it out. On a related note, QUEEN's drummer Roger Taylor describes Adam as "Camp Elvis"...
While we cannot be completely sure of the exact number of days due to the vagueness of its starting point, two things are clear: It is the longest Full Circle Arc we currently track, and the NBC performance felt like a Full Circle Moment to Adam himself, according to this AP interview:
Adam was one of the 75 artists photographed wearing Elvis' own sunglasses for the 2014 #1 best selling online book "Shades Of Elvis" by Christopher Ameruoso and Priscilla Presley. The book was announced on May 28, 2013 and became officially available on March 17. 2014. Here is the behind the scenes video from the photo shoot:
Other Elvis Connections
From Karaoke Tape To NBC Comeback Special
In December 1988 (as far as we can tell, as Adam merely recollects being "6 or 7"), Adam's Grandma bought him a Hanukkah present - a Karaoke machine, including an Elvis cassette. Years later Adam learned that the voice on the tape wasn't the real Elvis, but nevertheless this gift was the beginning of his decades-long fascination with The King as a singer and icon.
On February 17 2019, some 30 years and two months later (or approx. 11,000 days), Adam appeared on TV to pay tribute to the legendary singer as part of the 50 years anniversary celebration of the 1968 "Elvis Comeback Special".