1. You have to be awake. Any time will do; 2. There is no 'usual': any time from a day or so to 6 years or more; 3. Yes, sometimes; 4. There's a visual difference, but trying to describe it just produces inanities; 5. Yes, but it may take decades; 6. Usually just a few seconds; 7. No more than other so-called techniques.
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