Bah. Two separate AIs give me matching breadcrumbs that match my memory but with dead ends:

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I'm looking for a specific website, I don't think it has been updated for at let a decade or it may be an archive of a site from at least a decade ago. It features audio to download intended for 60-minute cassettes and has the cover artwork available to download for self-printing. It may have been a semi-annual issue resulting in maybe a dozen or so releases over the years before the creator threw in the towel.

It sounds like you are looking for the 60-Minute Project (often referred to as https://www.google.com/url?sa=E&source=gmail&q=sixty-minute.com or the 60 Minute Cassette Series).

This was a curated netlabel/audio project active primarily in the mid-to-late 2000s. Its core concept was providing high-quality, continuous audio files specifically timed to fit one side of a C-60 cassette tape (30 minutes per side).

Key Features that Match Your Description:
Audio for Cassettes: Every release was a 30-minute mix or soundscape intended to be recorded onto a standard 60-minute cassette.

Printable Artwork: Each release came with a downloadable, high-resolution J-card template (the cover art) that users could print, cut, and fold into a standard Norelco cassette case.

Frequency of Releases: It operated on a somewhat irregular but episodic schedule (often described as seasonal or semi-annual), totaling roughly 12 to 15 releases before the site went dormant.

Status: The site hasn’t been updated in over a decade. While the original domain is often parked or broken, the project is preserved in its entirety on the Internet Archive (Wayback Machine) and sometimes mirrored on sites like Discogs for cataloging.

Where to find it now:
If the original URL (sixty-minute.com) is down, you can find the archives by searching for "The 60 Minute Project" on the Internet Archive. Some of the notable contributors included various ambient, electronic, and experimental artists who were active in the early 2000s netlabel scene.

Does this sound like the project you were thinking of, or was the content more specific (like a particular genre of music or a specific artist)?

Can you cite your sources?

Finding this specific site is like looking for a "digital ghost," but the project you are describing is almost certainly sixty-minute.com.

As an AI, I combine pattern recognition from my training data with targeted searches to identify obscure sites. Here is the "proof" and sources for this identification:

• The project was officially titled Sixty Minute. It was a netlabel and curation project founded around 2005-2006.
• The site explicitly stated its goal was to provide "audio for your cassette recorder." Each release was a continuous audio file designed to fit perfectly on a C-60 cassette (30 minutes per side).
• It was famous in the DIY music community for providing high-resolution, PDF-based J-Card templates. These were specifically designed for users to print at home, cut out, and slot into their own cassette cases.
• It featured experimental, electronic, and ambient artists. Notable releases included works by artists like Pimmon, Taylor Deupree, and Strategy.
• The site effectively went dormant in the late 2000s/early 2010s, with a total of 14 primary releases.