during fifteen days

All of these insecticides significantly reduced the aphid populations during fifteen days in relation to those without treatment.
Todos los insecticidas redujeron significativamente el número de pulgones durante quince días en relación al testigo.
During fifteen days I demanded to hear the editorial arguments that backed this decision: was I lying, misreporting the truth, or exaggerating?
Durante quince días exigíque me expusieran argumentos editoriales para su decisión: ¿estaba mintiendo, falseando la verdad, exagerando?
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midnight