It's called Ambiancé. Caden Cotard would be pleased.
We're not entirely sure why you'd need to watch a seven-hour trailer in order to work out whether you fancy seeing a film that lasts for 30 days, but cancel your plans - one has arrived.
Swedish director Anders Weberg has released a second full-length trailer for his upcoming experimental film Ambiancé and it runs for a total of 439 minutes.
Weberg, who is also an artist, released a 72-minute long teaser trailer last year. He reportedly has an even bigger one due for release in 2018 (mark your calendars now) that will run for 72 hours. (Source)
Here's the new trailer: