Usually, clients or patients will need to attend at least 12-20 sessions that last around 50-55 minutes, on a weekly basis. However, improvements can be observed even after a few sessions. This is dependent on the severity of the depression, and it is likely that those with more severe forms will engage in CBT for several months or even a year until they start feeling better. CBT can be done in clinical therapeutic settings such as in person, but it can also be conducted online with a CBT therapist.