Marriage counseling lasts 3 to 6 months, depending on your needs and the issues you're hoping to resolve. A couple seeking therapy to resolve one small issue may benefit from fewer sessions, while a couple considering divorce may need 6+ months.
Weekly therapy sessions typically last 45 to 90 minutes. Most counselors recommend committing to one session per week for at least three months, as becoming comfortable with the therapy process and opening up to the therapist and each other takes time.