According to Google Earth, it's right around 12 miles from Rock Creek (White Rocks Marina) to the Inner Harbor.
Going by the Ruler tool it's about 2 miles just from the marina out to the rocks, and then another 3.5 or so to the Key Bridge. Four more miles to Fort McHenry, and then a quick 2.8 mile or so jaunt through the harbor to the landings in town.
Of course, YMMV depending on the course you follow. But six miles will just get you inside Key Bridge no matter how you go.
S/V Free Spirit
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