I rarely shave my legs during the colder months. During the warmer months I shave every day, that makes it easier if I miss some spots its not noticeable.
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"If you gaze long into an abyss, the abyss will gaze back into you." ~Nietzsche
In the spring and summer every other day (or at least I try to)....In the winter it really depends...I have been known to go for a week or 2...so I guess it's whenever DH complains about the stubble or asks "Are you planning on shaving your legs anytime soon?"