Definitely should not take that long.
Discussion
What do I do now? It says do not refresh
I don't want to give you bad advice maybe try opening a diffrent tab and try logging into umbrel 1st
If you know how to use the terminal you can try to restart from there and last do a forced restart. (Last 2 were google suggestions)
I updated mine and only took 10 min. Not sure if your using a pi or what.