BigQuery · Status at source date: Newsletter archive
Scheduling BigQuery queries on the hour can run them twice
Scheduled BigQuery queries set exactly on the hour can execute twice. Scheduling a few minutes before or after the hour avoids the double run.

Why it matters for advertisers
For you, this means duplicated data and wasted compute are preventable, so shift on-the-hour schedules by a couple of minutes.
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Scheduling BigQuery queries on the hour can run them twice
Scheduled BigQuery queries set exactly on the hour can execute twice. Scheduling a few minutes before or after the hour avoids the double run. For you, this means duplicated data and wasted compute are preventable, so shift on-the-hour schedules by a couple of minutes.
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