why its always 21 days Coz im really fed up with 21 as its my unlucky numbar.Is is possible 2 make it 20 or 22 days 4 my sake ???
The idea is to teach yourself the technology in a three-week time span, hence 21 days. It's more marketing than anything else. In fact, many "21 Days" books by Sams include *more* than 21 Days.