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Wow, that's surprisingly long. I thought formatting was supposed to be quick? Are you doing it by yourself, or did you send it to someone else to do it? Also, how big is the drive's capacity?

A quick format is usually quick... but a full format takes time and this is a 6 TB drive. 😆

Oh my... that's quite a big boy. But still, I didn't think it would take 3 weeks. I'm not an expert on hard drives, but I think you should really consider calling the manufacturer, or someone else for a bit of assistance. It really shouldn't take that long, and I fear it has been looping around for nothing.

I hope not... from what I read it should take 72h. Something's not right with this.

There's definitely something not right with that. I think maybe it's encountered some issues, and its looping around trying to solve it, and endlessly failing. I'm not really sure what to do, but maybe call up the manufacturer. Assuming its still got warranty, they're obliged to help you through the format, or maybe get a replacement if worst comes to worst.