[fan]

You're assuming here that enjoyment in life is some mathematic, static, function of number of years worked and number of years of free time. There are a lot of issues with that assumption.

First, there are non-linearities when you mix work and play. I personally know that if I wanted to do a full day of work and have two days allocated, I'd rather split them evenly between the two. That way each day I feel accomplished while still having fun and not being stressed.

Second, the above assumes that you're working just for the heck of resources, and work is inherently negative and to be avoided. If you love your work and it's innately important to you, you're not looking to get out as soon as possible. Thus, being able to work "just 9 years" isn't a real advantage.

Finally, this last argument is a personal preference, but I believe in a lifestyle philosophy that doesn't depend on delaying gratification for decades. We already did it once for 12 years for school, and if you extend by another 10-12 years, the better half of your life will be gone before you see any payoff. Life isn't saving for tomorrow, but rather what you experience today.