it sounds like you are wondering the distance horizontally from the medicine cabinet to the electrical box the sconce will be mounted over? How large are the sconces and how wide is the total wall that the medicine cabinet is mounted on? If you have a photo of the sconce, that would be helpful in recommending a distance for you. In general the lightbulb of the sconce should be slightly above eye level of the average person using that mirror if that helps.
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