Long School Days in Elementary Education: A Literature Review and Benchmark-Based Time-Budget Analysis for Children Aged 6–10
Year: 2026
Type: preprint
Abstract: Primary schools that keep children aged 6 to 10 on site from 9:00 to 17:00 are often justified by the learning time they add. We examine that justification by separating school presence from compulsory instruction, two quantities that policy debates tend to conflate. The review is narrative and covers instructional time, cognitive and teacher fatigue, sleep, recess and physical activity, distributed practice, children's reports, and international school-day models, with the Portuguese extended-day system (AEC) as the policy setting. We complement it with a deterministic 24-hour time budget built from OECD instruction-time benchmarks and paediatric sleep and activity guidelines. Among the causal studies of added instruction time and full-day schooling at primary age that we reviewed, several report small positive achievement estimates, others are too imprecise to establish their size or direction, and in the longest follow-up the gains are no longer detectable by grade 8; none reports a statistically significant average test-score loss. An eight-hour presence is about 85% longer than the OECD average of 4.32 daily hours of compulsory instruction. Holding other commitments fixed, raising presence from 6.5 to eight hours reduces unallocated waking time outside school by 1.5 hours; in an illustrative scenario in which the longer day absorbs half an hour of homework and the daily hour of physical activity, that time is unchanged, and any increase in commuting or homework enlarges the loss. Evidence on fatigue, sleep, play, and wellbeing as functions of day length is much thinner than the achievement evidence. Judgements about an eight-hour day at these ages therefore require evidence on its duration together with its composition, staffing, alternatives, and displacement of other activities; we specify the data needed to provide it.
Author: Ribeiro, Diogo
Institution: Universidade do Porto
Language: English
Subfield: Education
Field: Social Sciences
Domain: Social Sciences
SDG: Quality education
Open Access status: green
OpenAlex ID: W7214450048
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