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That's quite an acheivement. I recently re-discovered the power of this. If you can hit, say four hours in a day, and then the next day come back and do another four and another the next and so on, unlike when you are only doing a little a day, you start accelerating in your progress like nobody's business. I've started recommending increased daily hours as a result. As much as anything else, it's the familiarity you have with your instrument. :-)