Adele initially put together a 15-minute version of her new track I Drink Wine, before she was told to cut it down to a more manageable length.
The 33-year-old star said her record label advised her that the song was too lengthy, with the finished version clocking in at just over six minutes.
Read more: Adele fans shower new album with praise
She told Rolling Stone that her label said: "Listen, everyone loves you, but no one's playing a 15 minute song on radio."
I Drink Wine is now being released as the second single from the 30 album and will hope to follow first single Easy on Me to the number one spot on the UK Singles Chart.
The singer said that the emotional ballad was driven by self-doubt in her life and a suggestion by a friend that she record herself in those moments.
One of those monologues is reflected in a candid spoken word portion at the end of the track.
She said: “I took everything so personally at that period of time in my life. So the lyric ‘I hope I learn to get over myself’ is like: ‘Once I’ve done that, then maybe I can let you love me'.”
Adele has noted that much of the songwriting on 30 came about in the wake of her divorce from husband Simon Konecki in 2019.
30 was unveiled earlier this week and is Adele's first studio album since the release of 25 in 2015.
In tandem with the release of 30, she has convinced Spotify to remove the shuffle function from its album pages so that records can be enjoyed in the order the artists intended.
The star tweeted: "This was the only request I had in our ever changing industry! We don’t create albums with so much care and thought into our track listing for no reason.
"Our art tells a story and our stories should be listened to as we intended. Thank you Spotify for listening."
Watch: Adele uses voice recordings in new song