My internet is 40mb down and it took 24min, so check your speeds and maybe reconnect w a cable instead. I would use the official one since it just released so you knwo you go tthe right final one. Apple server side seems to be fast enough that it would not be the source of your slowness.
sierra has been live before you posted by about 10 minutes
What I meant was that Sierra was live but only through a link, there was no banner or anything up for Sierra yet. So I figured once they put Safari 10 up live, they would follow up with an official banner and what not for Sierra.
Just as I finished typing this, macOS Sierra just finished downloading! Time to install.