Just think, in seven minutes, you could watch Miley Cyrus' 'Wrecking Ball' video twice over. You could make half of a Jamie Oliver 15-minute meal. You could even watch a 25th of Avengers: Endgame.
Basically, it's a really long time - especially to be doing nothing but standing and clapping, which surely means Once Upon a Time in Hollywood must be one hell of a movie.
But while director Tarantino is already being heaped with praise from critics, perhaps the biggest talking point from the film's Cannes debut is the partnership of Leonardo DiCaprio and Brad Pitt, who star as former TV actor Rick Dalton and his stunt double Cliff Booth.
Pitt and DiCaprio in Cannes. Credit: PA
"It's hard not to think back to the energy of the previous best pairing in a Tarantino film, John Travolta and Samuel L. Jackson in Pulp Fiction," Time Out reviewer Dave Calhoun said.
Jake Coyle of the Associated Press called DiCaprio and Pitt 'fabulous', while The Hollywood Reporter's David Rooney described the two actors' performances as 'dripping with self irony and pleasurable chemistry'.
Guardian critic Peter Bradshaw tweeted: "Quentin Tarantino's brilliant exploitation black-comedy Once Upon A Time In Hollywood finds a pulp-fictionally redemptive take on the Manson nightmare: shocking, gripping, dazzlingly shot in the celluloid-primary colours of sky blue and sunset gold."
Alongside DiCaprio and Pitt, Tarantino's ninth film also stars the likes of Margot Robbie, Al Pacino, Kurt Russell and Dakota Fanning.
Margot Robbie as Sharon Tate. Credit: Sony
The movie tells the tale of former TV actor Rick Dalton (DiCaprio) and his stunt double Cliff Booth (Pitt), following their attempts to break into the film industry during 1969 in LA - right at the time of the famous Manson Family murders.
In a press release issued last year, Tarantino explained: "Both [Dalton and Booth] are struggling to make it in a Hollywood they don't recognise anymore. But Rick has a very famous next-door neighbour... Sharon Tate."
He continued: "I've been working on this script for five years, as well as living in Los Angeles County most of my life, including in 1969, when I was seven years old.
"I'm very excited to tell this story of an LA and a Hollywood that don't exist anymore. And I couldn't be happier about the dynamic teaming of DiCaprio and Pitt as Rick and Cliff."
Following its premiere at Cannes this week, Once Upon A Time In Hollywood will be released on 26 July in the US and on 15 August in the UK.
Featured Image Credit: Sony