You can update a dataset's default table expiration time by:
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Using the GCP Console or the classic BigQuery web UI
 
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Using the bq update CLI command
 
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Calling the datasets.patch API method
 
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Using the client libraries
 
To Update a dataset using console:
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In the Resources pane, select your dataset.
 
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In the Details page, click the pencil icon next to Dataset info to edit the expiration.
 
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In the Dataset info dialog, in the Default table expiration section, enter a value for Number of days after table creation.
 
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Click Save.