What Is the Frequency We Can Run the Crawler? Crawler frequency (how often we collect the same data from the same sources) is one of the first decisions that determines cost, feasibility, and data quality  in a web scraping program . In theory, you can run a crawler as often as you want. In practice, the “right” frequency is a balance between: How fast the underlying data changes : price, inventory, availability, promotions, fees How much risk you can tolerate : missing chang