While there is no exact answer to this question, the research shows that Emotionally Focused Therapy (EFT) has been demonstrated to help couples without histories of trauma, affairs, addictions, and aggression in as little as 15-22 sessions. This means that if you or your partner have a history of trauma, affairs, addictions, aggression (but not physical abuse), EFT may last longer than 15-22 sessions due to the relationship attachment injuries. It is important to note that outcome research for couples struggling with infidelity who seek EFT have reached higher levels of success than other forms of couple therapy, upwards of 70 to 90%.  Combined with a caring, compassionate EFT therapist, the relationship can even become more connected than before.