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At 0.5% out of the 10080 minutes in a week, you have 50 minutes of inaccuracy, at 0.005 you have 0.504 minutes of inaccuracy. If you ever run anything that needs to keep track of time, I would go with the crystal. Say you wanted to build a uC controlled servo pan/tilt platform for a camera to do long term timelapse (one of my WIP projects actually), you would want good time accuracy if you wanted a slow timelapse pan across a skyline, ending at a certain angle on a certain date, not earlier or later.
Really though if you need *extreme* accuracy you could always use a GPS receiver as a external time source.
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