For a quick and rough answer, 2.6 inches. For an exact answer, 1 mm = .03937 inches, so 65 X .03937 = exact distance in inches of 65 mm.
This site will enable you to convert from one length unit to any other. 65 m"m = 2.599 inches
65 millimeters = 2.55905512 inches
google search has a built in calculator, that should be useful, just type for example 65 mm in inches and you'll get the exact result I mentioned above.
1 mm=0.0393 inches
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