Long term relationship is a common, contemporary term for intimate interpersonal relationships that may be lifelong and may or may not consist of marriage. Long term relationships are considered the opposite of casual relationships, which are short in duration. People[attribution needed] often consider about six months as a reasonable milestone for a relationship to be recognized as long term. The notation "LTR" is used to designate "long term relationship" in personals advertisements. In some countries, when a long term relationship that is neither a marriage nor a civil union ends and both partners have a financial interest in the relationship, a suit for palimony may be filed by one or both partners.
