Among active duty service members, mental health disorders were the second most frequent diagnostic category documented on medical encounters in 2022. Additionally, mental health disorders accounted for over half of all hospital inpatient days during this time. A large portion of the Department of Defense (DoD) operating budget is directed for healthcare. Given the amount of care related to mental health disorders, it is not surprising that a significant portion of the DoD’s healthcare costs are related to behavioral health treatments. However, despite the DoD’s commitment to and investment in behavioral health services, the demand for care continues to exceed the capabilities of military clinics. Provider caseload has long been thought to be associated with a clinic’s ability to provide care at scale. Our group previously found greater provider caseload was associated with fewer intakes completed, suggesting caseload, indeed, may be associated with decreased access to care. Importantly, access to care extends beyond initiating care (i.e., intake appointment) and also includes the ability to schedule follow-up appointments. Therefore, we sought to extend our previous findings by examining the effect of provider caseload on time between appointments and the subsequent effect on a patient’s total number of appointments. We hypothesized greater caseload would be positively associated with time between appointments, such that patients seen by providers with a greater caseload would have longer wait times between appointments. We further hypothesized that time between appointments would be negatively associated with total number of appointments. Data were obtained from the Military Health System Data Repository for calendar years 2007 to 2015 via the Person-Event Data Environment. Medical encounters of active duty service members were examined across 220 military mental health clinics. The results supported our hypotheses. Caseload was associated with an increase in time between appointments. Specifically, an increase of one standard deviation (0.41) in caseload was associated with a 0.37-day average increase in wait time between appointments over the following three months. Notably, this relationship differed across time with a decrease in wait time in month one and an increasing delay in appointment lag over the next two months. A one standard deviation (3.5 days) increase in wait time between appointments was associated with an average decrease of 1.3 sessions. These results indicate a significant positive relationship between provider caseload and wait time and a significant negative relationship between time between appointments and average number of sessions. Importantly, the total number of appointments does not distinguish between termination due to remission of symptoms and termination for other reasons, such as dropout. We propose that for some patients, greater wait time between appointments may increase the likelihood of dropout. Alternatively, patients with less severe symptoms, thus requiring fewer sessions to remit, may be more likely to have greater time between sessions. Taken in conjunction with our prior findings, we suggest provider caseload may be a key target for improving access to care for service members and improving mental health across the Force.