it depends upon your selection. If you want to add them only upon activation, it calculates the included contacts in the segment and adds them at once (when you hit activate or when it activates upon reaching the scheduled time). if you select keep adding every hour, then it evaluates every hour and keeps adding new members (think of it like a filter that runs every hour). Flattening them to a list will make sure you have just that pool of contacts. That should be your best bet
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