Depending on the type of data for the email campaign, used to apply the range Time Frame Start / Time Frame End on this field to analyze the data.
Autoresponder Max will batch the modifications of carts, orders, and customers by reviewing the changes to the field selected in Time Frame Field. Most commonly, this is Created or Modified, but email campaigns that use orders will have Shipped and Reconnect email campaigns will several other options. This field looks at all the applicable data that its age is between the Time Frame Start and Time Frame End.
For example, for orders that were shipped 7 days ago, the Time Frame Field would be set to Shipped and Time Frame Start would be set 7 Days.