Can you give examples of these and how long a period these are taken into consideration in the marriage prior to the end
The time period for which the judge will hear evidence of fault is within the judge’s discretion. You can read more about fault in the statute containing the definitions for divorce from bed and board, N.C.G.S 50-7:
The court may grant divorces from bed and board on application of the party injured, made as by law provided, in the following cases if either party:
(1) Abandons his or her family.
(2) Maliciously turns the other out of doors.
(3) By cruel or barbarous treatment endangers the life of the other. In addition, the court may grant the victim of such treatment the remedies available under G.S. 50B 1, et seq.
(4) Offers such indignities to the person of the other as to render his or her condition intolerable and life burdensome.
(5) Becomes an excessive user of alcohol or drugs so as to render the condition of the other spouse intolerable and the life of that spouse burdensome.
(6) Commits adultery.