Treatment cycles last 5 or 6 weeks; please see the intake calendar for specific dates and lengths. Round Lake operates on a closed-intake system, which means there are designated intake dates throughout the year. All clients in each group start and end their treatment on the same dates, and then a new group comes in. In addition, 4-week programs are offered during each intake for past clients who have maintained their sobriety and want a refresher. These clients would arrive in week two of an existing treatment program and end (Marble) with that group.