In B2B sectors, the sales cycle often spans three to four months or longer, which complicates the evaluation of marketing performance compared to B2C. When companies attempt to match monthly marketing expenditures with revenue from the same period, the resulting data fails to reflect actual performance because current revenue is often generated by leads acquired months earlier.

The primary challenge for businesses with long sales cycles is to accurately assess marketing results and plan future advertising investments despite the delayed return on investment. Relying solely on the month of deal closure provides insufficient insight into the effectiveness of specific marketing channels, requiring more sophisticated approaches to attribution and financial reporting.