[atomical]

I had deactivated my Facebook account. After I read your comment I decided to log in and try to get this dump. I waited probably ten minutes and it still hadn't finished. After that period I lost interest in having my Facebook open so I suspended the account which probably canceled the background job. This feature is slow as fuck.

[qznc]

It took a few hours in my case. You don't need to be logged in, though. They sent me an email, when it finished.

I assume they have a low priority batch system to handle these requests.