Originally published at: http://www.howtogeek.com/193373/how-does-windows-determine-the-amount-of-time-it-takes-to-perform-an-action-with-a-file/
The ‘time remaining’ estimations on Windows are enough to drive anyone crazy at times, but have you ever wondered how Windows determines those times? Today’s SuperUser Q&A post has some answers for a curious, yet frustrated reader’s question.
Alright, so why is the Teracopy estimation so accurate? Right off the bat it seems to be fairly accurate.
It doesn't. Simple as that.
3 days... Less than a minute... 5 seconds... ... ... ... ... 0 seconds... ... ... Done.
In Windows, the "progress" bar goes from 0 to 90% quite quickly, and then the remaining 10% might take a couple of hours, or a day, or it might never happen.
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