A healthy lifestyle has proved beneficial health effects in managing type 2 diabetes mellitus (T2DM). Important lifestyle behaviors, i.e. sleep, sedentary time (SB), and physical activity (PA) subdivided into light physical activity (LPA) and moderate to vigorous physical activity (MVPA), have shown an impact on T2DM disease-specific characteristics (e.g. glycemic control). However, these behaviors have often been investigated separately. Therefore, a recent shift in research emphasizes the importance of considering these behaviors as part of a 24-hour day. Since T2DM patients can benefit from an optimal 24-hour composition as part of a healthy lifestyle, it may be interesting to investigate the 24-hour movement composition among these T2DM patients over time. Moreover, exploring associations with different personal determinants, environmental determinants, and cardiometabolic markers will provide meaningful insights in developing recommendations and creating an intervention.