I left my dist-upgrade running all morning and most of the afternoon yesterday. It stuck on the wolfram-engine package and it was making several hundred "get" requests to archive.raspberrypi.org. From time to time a message appeared telling my that the down load speed was 1.6 bytes per second. Not good for a 240 mb package!
I gave up in the end and purged that package as I don't need it. On restarting, download speeds, as reported by dist-upgrade were far far fasted and everything after wolfram updated in a few minutes.
So had I needed wolfram, I would have spent a good few hours more at 1.6bytes per second to get the latest updates.
Why do they put lightning conductors on churches?
Why did Tarzan never have a beard?