It might seem ponderously long, but the trailer, which you can see above, says explicitly that: “This is a short 72 minute teaser.” At 72 minutes, "short" is relative. Two years from now, the film's website promises, there will be a "short trailer"—that will last 7 hours and twenty minutes.
Ambiancé will premiere on New Year's Eve 2020. It will also be Weberg's last film.
On the film’s website, Ambiancé is described as "a sort of memoir movie":
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.
The full 720 hour film will only be screened once, starting on December 31, 2020. The Verge reports that it will be screened simultaneously on every continent and then promptly destroyed.
The teaser is likewise ephemeral. It will only be available online until July 20th.