The allowable period between when someone viewed or clicked your ad and took action is called the:

The Attribution Window defines the timeframe during which a conversion (e.g., a purchase, sign-up) can be credited to a specific ad interaction (view or click). This window is crucial for understanding the effectiveness of your advertising campaigns, as it determines how long after an ad exposure you consider that ad responsible for a subsequent user action. "View-Click-View-BuyWindow" is not a standard industry term. "User Action Window" is too broad and doesn't specifically refer to the ad-to-conversion relationship.