My most valuable ideas have always come to me in a flash. Once they come, they almost self-execute. The dialogue between concept and execution suggests what to do next.

My very worst ideas have limped into existence and have required considerably more effort to execute.

If someone measures the value of what I do in terms of how long it takes me to produce an outcome they will judge my worst work most valuable and my best work nearly worthless.

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In order to measure value, you have to actually understand the value you are measuring. People buy results, not time.

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An excellent article on billing by the project or by the hour: http://www.1099.com/c/ar/ta/HowToCharge_t042.html