How does it feel?

EDIT:

I went back to looking at the sources, interesting that they are still being updated. Maybe one day they will release the film online. It is stated that it was released to the public domain as the author of the work cant be determined and anything before 1953 has no copyright.

Anyway, at the writing of this, the only news I can find on this are blog articles, twitter posts and the such (togetter). Searching the main website turns up nothing (though searching すづみ船 gives you a link to "Archive of Lights" a video made for the website) I did a search for Kimura Hakuzan, who is the believed creator, but I only found links to their blog (film archive) that was last updated in 2018, along with a pamphlet from a past event. The wikipedia stated that it became apart of the archive in (令和元年) which means past April in 2019 so from there to December, at sometime it was added to the archive. Then again, the writer could be referring to that is where it now resides (as of writing), as the source that is provided is via the wayback machine and doesnt really state when it was added to the archive.

I understand that your post was mainly to speculate the length of the film, but by the archive we are given 10 mins, unless proven incorrect, the length of the film is 10 mins.

Amffy said:
An update: Here is some things I've learned from the Japanese Wikipedia page. I checked the sources they cited. (In broken English from Google translate, of course);

The picture is completely wrong and isn't from Suzumi-bune. It's from another one of Hakuzan Kimuras works called "Nonkinatousan ryū miyamairi". It's from 1925 and isn't pornographic. The Anime Man used this picture as well. It's not from the movie. So please, if a moderator sees this post, please change that.

And from what I could gather from the messed up English, in 2018, one year after the 35mm print was donated to the National Film Archive of Japan, at a research presentation and screening dedicated to Hakusan Kimura (held by the Toy Film Museum?) they had asked the Film Center to borrow Suzumi-bune and "due to the agreement with the donor, it cannot be released.", where the museum has since requested the Film Center to make the film available to researchers.

So from what I can gather, the donor of Suzumi-bune is a complete asshole and won't even let researchers see the damn film, let alone the public! WTF!

EDIT:

Got it edited again, this time it should stop people from uploading or approving any images.