@pjtaylor In Daniel Kahneman's book Thinking, Fast and Slow you can’t find something that helps with the issue of time and passions. The lack of understanding for what Kahneman explains around page 40 is one of the largest barriers preventing educators from moving to project based learning. They are hung up on “time requirements” for factory methods of learning which are nothing about mastery and they can't see how learning around passion projects is so much more efficient.
When a passion is discovered and early learning related to a passion has been converted to mastery or intuition, people are able to use this transformational knowledge and enter what Kahneman calls “a state of effortless attending” or Flow. In this state, people lose their sense of time, of themselves,and their problems. In this state there is no mental effort required for the purpose of self-control related to focus or paying attention. All of the brain power being used for self-control in boring learning environments, is under this type of learning environment available for acquiring additional knowledge gathering related to their passion project. Far more knowledge is acquired and converted into true learning or mastery under these circumstances, in much less time than in factory learning environments.
You used the description “Private Universe” for what Kahneman is describing as Flow. There is no need or requirement to rush people in this private universe that naturally comes with passionate project work. As Seth Godin points out, you don't need to worry about getting people to do more art. http://goo.gl/Utu40N