Have you lost any referrals because of inactivity lately - wich sites ?????

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So this week I lost some referrals at VIPbux because they have not been clicking last 20 days. Of course not a big loss since they did not click. But having a lot of sites testing and with some not on my priority list it would be great to hear if there are any other sites that will delete us for being inactive and after how many days. Thanks!