How long will the Windows 10 upgrade take?

[Windows Central Question]

How long will the Windows 10 upgrade take

I've been hearing that the Windows 10 update will take a few hours. Is this true? I don't want to have to leave my computer plugged in while it updates but I want to make sure that I have enough power to get it done?

 

[realwarder]

Leave it plugged in. Can take 1 hour to infinity

 

[anon(9598047)]

It depends your computer. On my pc, it took about 20 minutes