I have a feeling it's made for children/young adults maybe. It's still interesting tho.  

 I’ll still watch it at some point haha. The nun is helping run an orphanage so maybe they have seen that movie 😃 

 Into Great Silence (German: Die große Stille) (2005)

Trailer:
https://www.youtube.com/watch?v=rI1w1DDdH1I

wikipedia: Gröning proposed the idea for the film to the monks in 1984, but the Carthusians said they wanted time to think about it. They responded to him 16 years later to say they were willing to permit him to shoot the movie if he was still interested. Gröning then came alone to live at the monastery, and to stay in the enclosure, where except for the order's aspirants no visitors are allowed, for a total of six months in 2002 and 2003. He filmed and recorded on his own, using no artificial light.

Afterwards, he spent two and a half years editing the film. The final cut contains neither spoken commentary nor added sound effects. It consists of images and sounds that depict the rhythm of monastic life, with occasional intertitles displaying selections from Holy Scripture.