I am trying to clear my cache but nothing has happened besides the wheel spinning. It has been doing that for at least an hour. Is it supposed to take this long or is something wrong?
Have you managed to clear the cache finally?
I just tested it that clearing cache(about 600M) on my side just took less than two minutes using the latest version of Power BI Desktop(2.51.4885.701 64-bit (October 2017)). I'm not sure if it is supposed to take this long or is something wrong on your environment, as there is currently no supposed clear cache time documented.