Previous research has established numerous outcomes associated with taking service-learning coursework during college. However, most studies have examined the impact of three- or four-credit courses involving engagement of several hours per week, and other research has suggested that the gains associated with service-learning are directly related to the amount of time spent engaging with the community. This study explored whether one-credit courses employing a single, sustained community immersion experience (2-7 days) are capable of improving college student outcomes. A total of 354 students who participated in one-credit service-learning courses, along with 115 students who participated in three-credit summer service-learning courses with longer immersions (8-10 weeks), completed surveys gauging orientations toward equality, justice, and social responsibility. Students in the one-credit courses gained significantly on the majority of outcomes, and these increases were generally comparable to those of students taking longer three-credit courses. Implications for practice are discussed. (Contains 2 notes and 4 tables.)