There is an optimal length of time for training sessions to maximize retention
the verdict
SUPPORTED
the evidence backs this
confidence 70/100
Extensive empirical research, including meta-analyses and randomized trials, demonstrates that spacing training sessions over time (distributed practice) generally optimizes long-term skill retention and learning compared to massed practice, although specific motor skills or contexts may occasionally show short-term benefits from massed schedules.
Evidence for · 6
Optimal training frequency for acquisition and retention of high-quality CPR skills: A randomized trial.
2019 · cited by 246
Demonstrates that monthly distributed CPR training sessions are significantly more effective for one-year skill retention than 3, 6, or 12-month intervals.
Evidence against · 1
Differences in the Effect of Learning Methods Massed Practice Throwing and Distributed Practice on Learning Outcomes Skills for the Accuracy of Top Softball
2019 · cited by 6
Found that massed practice yielded a significantly higher percentage increase in softball throwing accuracy compared to distributed practice in this specific context.
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More for · 5
Effectiveness of motor sequential learning according to practice schedules in healthy adults; distributed practice versus massed practice
2015 · cited by 43
Shows that distributed practice schedules enhance motor skill acquisition and retention compared to massed practice.
The Distributed Practice Effect on Classroom Learning: A Meta-Analytic Review of Applied Research
2025 · cited by 11
A meta-analysis of classroom learning confirms a moderate overall benefit for distributed practice over massed practice on retention and learning outcomes.
Role of Massed Versus Distributed Practice in Learning Novel Foreign Language Utterances.
2019 · cited by 6
Finds that distributed practice schedules result in superior learning and retention of novel foreign language utterances compared to massed practice.
Specific patterns of neural activity in the hippocampus after massed or distributed spatial training.
2023 · cited by 4
Indicates that spaced training with appropriate inter-session time intervals promotes greater stability and persistence of memory traces in the hippocampus.
The impact of temporal distribution on fear extinction learning.
2025 · cited by 2
Demonstrates that temporal distribution and spacing of learning sessions critically impact long-term extinction retention.