Evidence to validate the use of fixed-time (FT) reinforcer delivery (i.e., noncontingent reinforcement) with typically developing populations has been relatively rare in the behavioral literature. In those studies that have provided validation, reinforcer delivery schedules appeared to be prohibitively dense for sustained implementation of procedures. This study demonstrated the efficacy of using FT reinforcer delivery to reduce off-task behavior of 2 typically developing third graders using a teacher-selected schedule (FT 4 min). Immediate reductions in off-task behavior were observed for both children. Challenges in identifying the operative mechanism of FT schedules in natural settings are discussed. (Contains 1 figure.)