When I launched unity hub it said that it was ready to update to the next version when the program was restarted, so I clicked the button it provided to restart and update, it asked for permission to make changes to the computer and I gave it the ok, then nothing was visibly happening. I opened my task manager and saw "the official unity hub using between 10% and 40% disk usage at any given time. It’s been about 7 minutes now and other than the disk usage nothing is still happening, how long does it take for the update to happen?
nevermind, it finished about 8 minutes later.
Generally it depends on your Internet speed, if you have crap Internet, downloading stuff will take longer.