Took one year of rehearsal before shooting.
Only a 5 person crew, including the actors.
The longest unbroken take in the film lasts about 5 minutes and 4 seconds.
Took 6 months to write, 7 months to cast, 1 year to rehearse and 2 days to shoot. On the day of the shoot, the whole film was shot in one continuous shot 3 times and edited together later, using the best takes. The sound design took twice as long as the actual cutting. Everything took about two and a half years to complete.