Cloud Kicks wants to be able to build a segment of customers who have visited...

The filter operator Last Number of Days allows you to filter on date fields using a relative date range that specifies the number of days before today. For example, you can use this operator to filter on customers who have visited your website in the last 7 days, or the last 30 days, or any number of days you want. This operator is useful for creating dynamic segments that update automatically based on the current date12. References:

Relative Date Filter Reference

Create Filtered Segments