The 'approach to study'

http://roadtograndmaster.com/
This guy's blog is a very interesting read. From reading it, he appears to face a dilemma. Should he continue practising lot's of varying material within a 7 hour period or should he concentrate on one particular area? Nimzowitsch seems to think that concentrating on many chess disciplines in one day will only lead to confusion ... Therefore a choice is made. The guy on the road to grandmastery will now concentrate on just 'one' subject area until he's totally nailed it! I'll try and take the same approach ...!