The teaser for the longest film ever made has been released. Clocking in at 72 minutes, the trailer for new film Ambiancé is a mere drop in the water compared to the eventual run time of 720 hours, or 30 days. Directed by Swedish experimental filmmaker Anders Weberg, Ambiancé is set to premiere in 2020 after a series of successively longer trailers have been unveiled.

The new trailer is currently available to watch until the 20th July via Vimeo and "is supposed to convey the mood from the full film," according to Weberg's blog. On the 3rd July, he reported that a total of "280 hours [was] finished of the full 720 hours."

Soundtracked by the German composer Marsen Juhls, the new trailer is an ominous exploration of mood and lighting. The 30 day-long film will be shown in its full length starting from the 31st December 2020.

Describing the film as "a sort of memoir movie," Weberg says that "In the piece Ambiancé space and time is intertwined into a surreal dream-like journey beyond places and is an abstract nonlinear narrative summary of the artist's time spent with the moving image."

Watch the first 'Ambiancé' trailer here.

Experimental film fans looking to eventually own a copy of the astonishingly long picture will be disappointed: Ambiancé will only be shown on a single occasion "synchronised in all the continents of the world" before being destroyed.

Following the 72 minute trailer, "The first short trailer" lasting 7 hours, 20 minutes will be released in 2016 before the meatier 72 hour "Longer trailer" will be dropped in 2018. People looking for more tangible artefacts from the film can look forward to prints made from film stills which are being made available to buy by Weberg every month until the film premieres.

More: Our top five movies from Cannes Film Festival 2014.

The film is dedicated to Weberg's son, André, who apparently died earlier this year due to an overdose. "Much of my works over the years has centered around him. This is for him," the director explains.

Ambiancé will be shown from the 31st December 2020.

More: Alexandre Desplat to head Venice Film Festival 2014 jury.