This question highlights the complexities of digital measurement. Attribution windows are not one-size-fits-all, and understanding their nuances is critical for accurate reporting. Platform Variation: Every advertising platform (Pinterest, Meta, Google, TikTok) has its own default attribution settings. For example, while Meta often defaults to a 7-day click and 1-day view, Pinterest has historically used a 30/30/1 or 7/7/1 model (Click/Engagement/View). These differences can cause the same conversion to be claimed by multiple platforms, leading to "over-reporting" if you simply add up the numbers from each dashboard. Wait for Data Accuracy: Because Pinterest users are often in a planning mindset, they frequently convert days or weeks after their initial interaction. In fact, Pinterest research shows that a significant portion of conversions occur up to a week or more after ad exposure. Pulling reports too early—before the attribution window has closed—will result in an incomplete picture, making your CPA look higher and your ROAS look lower than it actually is. Varying Conversion Timelines: Users use Pinterest differently than they use Instagram or Google Search. On Pinterest, a user might save a "Living Room Idea" Pin in January but not purchase the rug until they move in March. Because of these longer paths to purchase, Pinterest often requires longer windows to capture the true value of the "inspiration" phase that started the journey.