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How Many Users Or More Must A Remarketing List Have Before It Can Be Used In A Search Network Ad Campaign? [Solved]

1,000 members The advertiser requires a minimum of 1,000 members on their remarketing list for it to be eligible on the search network. This means that the advertiser’s website must receive at least that many unique visitors (not sessions) within the timeframe of your remarketing list.

How to Set Up Google Remarketing Lists for Search Ads (RLSA) Campaigns

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Introduction to Remarketing Lists for Search Ads

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FULL tutorial on Google