Different usage limits for Sync depend on your Airtable plan. See the screenshot below for a quick highlight, or visit airtable.com/pricing for more details.
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Pricing and usage limits for sync

Best answer by Jason11
@DavidVM Every base can have a maximum of 20 synced tables coming into the base depending on your workspace plan. That means that you can sync a table to any number of bases, but each specific base can only have up to 20 synced tables in it.
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