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(a) Don't work 12 hour days as a contractor.

(b) Raise your rates.

I like the consistency and simplicity of this message. I've noticed that when people have a message this simple and repeat it a lot they usually know exactly what they're talking about. tptacek is on point here.

I don't care what your reason is for charging less. I don't care if money isn't important to you. Try it. Talk less about why you charge this or that. Challenge your own assumptions and try raising your rates.

It turns out that if you quote a weekly rate clients are willing to pay more money.

This is an interesting assertion. Do you have a reference?

Were you to provide a matrix (4hr min @ $150 per, $1000/day, $4000/wk) you would also get paid for every hour you work but you would create opportunities in the client's mind where they could actually help you bill more hours.