How long might reinstalling os x yosemite take? I am doing a factory restore and have had the grey screen 'setting up your mac' for 36 hours. I have a slow internet connection, maybe 15 megs.
I was thinking of selling my mac and so have begun a restore factory settings following the onscreen prompts. I have got as far as trying to reinstall os x through my internet connection. I have now had the grey 'setting up your mac' screen for 36 hours. I know I have a slow internet connection, basic package of maybe 10 megs. I don't know whether to let it carry on as is, or power off. Advice, please, but I am not very tech savvy.
iMac (21.5-inch Mid 2011), iOS 8.4, Downloading latest version