But it is accurate - at that point in time, the time left is valid. If you suddenly go mental with the CPU then yes it would be inaccurate. I would argue that

But it is accurate - at that point in time, the time left is valid. If you suddenly go mental with the CPU then yes it would be inaccurate. I would argue that some indication is better than none. On the same machine, I can run Windows and get an estimate on the time left until it is flat.