Time Flies (stylized in sentence case) is the first greatest hits and second overall compilation album by Japanese idol girl group Nogizaka46.

It was released on December 15, 2021, through N46Div., and Sony Music Records, two years and nine months after its predecessor studio album, Ima ga Omoide ni Naru made (2019) for the tenth-anniversary celebration of the group.

Commercially, Time Flies debuted atop both the Oricon Albums Chart and Billboard Japan Hot Albums and certified platinum for physical release by Recording Industry Association of Japan (RIAJ), selling over 250,000 copies Nogizaka46, a Japanese idol girl group was formed on August 21, 2011, labelling as an "official rival of AKB48",[1] and debuted on February 22, 2012, with the single "Guruguru Curtain".

[7] On November 18, Mai Shinuchi, a second generation member, announced graduation from the group in late January 2022 on her radio show Nogizaka46's All Night Nippon.

They put up a promotional poster on the station's billboard to announce their tenth-anniversary greatest hits album, scheduled for release on December 15.

To promote the album, the members announced a campaign to put up posters on billboards in all 38 stations with the ending word "-zaka" (坂) in Japan.

[15] The album's promotional poster shows six girls who show only the lower body walking and running with different costumes: from left to right student uniform, the group's purple tracksuit, "Kimi no Na wa Kibō" navy school uniform, "Kizuitara Kataomoi" purple dress, "Sayonara no Imi" red dress from 67th NHK Kōhaku Uta Gassen, "Influencer" violet outfit from 59th Japan Record Awards, and the group's "Kimi ni Shikarareta" current uniform, subtitled with the text "乃木坂46 10th Anniversary BEST ALBUM 12.15 Wed on sale", that shows 10-year reminiscence of the group.

[18] All cover artworks of Time Flies except the Sony Music Shop limited cover were unveiled on November 8, showing lots of mannequins that wear Nogizaka46's performance costume and uniform taken at Nogizaka Station in the nighttime with dim light, which was based from their debut studio album Tōmei na Iro.

[19] These artworks were shot around mid-October by Yoshiharu Ōta, and handle the production by Takumi Kawamoto, Wataru Yoshida, and Noboru Wada, who worked with the first studio album.

[24] Nogizaka46 performed "Saigo no Tight Hug" for the first time at YTV's Best Hits Kayosai on November 11, 2021, alongside "Gomen ne Fingers Crossed".

[28] The group performed "Saigo no Tight Hug" at Fuji TV's FNS Music Festival on December 8, alongside Ikuta and Yuki Saito's collaboration "Sotsugyō".