The 1,000 hour rule for would be entrepreneurs

Pretty good advice... being an entrepreneur is a marathon, not a sprint (Lifehacker):

I was chatting with my friend David from Greenback Tax Services the other day about these misconceptions. I said: "people don't understand they need to be poor for 1000 days." Our basic hypothesis: you'll be doing worse than you were at your job for 1000 days after you start your muse business.

I've seen it happen a bunch of times. For many of us it's been almost exactly those 1000 days it took for us to get back to the level of income we enjoyed in our corporate days.