How is the estimated retirement determined?

In most cases, LEGO does not release the exact retirement date of a set in advance. BrickEconomy predicts retirement dates by analyzing several factors, including tracking the 'Sold out' cycles in different LEGO retail markets, examining the relative lifespan of similar sets, and using a machine learning model for more accurate predictions. By combining these factors, BrickEconomy creates a confidence score and estimated retirement date, which are updated frequently.