Is there a relationship between the characteristics of drug addiction treatment programs and an important correlate of better outcomes, the length of time clients are in treatment? Previous research has consistently shown longer periods in treatment and a range of services each have a salutary effect on client outcomes after treatment. Much of this research has examined the characteristics of clients. Program attributes are another important consideration. Multivariate analysis of data collected from a national survey of outpatient drug addiction treatment programs shows offering a range of services along with several other program characteristics are relevant to the duration of treatment. When a range of services are available, this has a positive association with both the number of months programs report clients are in treatment and with the number of counseling sessions programs report clients receive over the course of treatment. Ultimately, this should lead to better outcomes for clients.