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A few times a week is pretty normal for a long term relationship, or anything really once your past the 6 month fuck like bunnies stage.
Obviously it will vary based on schedules, stress, kids, etc but should be at least a couple of times a week. Aside from the stress relief parts, it's a way to bond with your girl and for her to bond with you.
If your at every 4-6 weeks and see her more than once every 4-6 weeks it is time to walk away and find someone new.