English version

at weekly/20-minute etc intervals

From Longman Dictionary of Contemporary Englishat weekly/20-minute etc intervalsat weekly/20-minute etc intervalsREGULARevery week, 20 minutes etc The trains run at half-hourly intervals. interval
Examples from the Corpus
at weekly/20-minute etc intervalsAfter ingestion of sucrose, breath hydrogen was measured at 20 minute intervals for 160 minutes.
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