Brent Chudoba of SurveyMonkey gave a presentation on lifetime value (LTV) to marketing students. He discussed how companies can calculate the lifetime revenue (LTR) of a customer by multiplying average monthly subscription cost by average number of months subscribed. For example, using $10/month for Netflix and an average subscription length of 18 months yields an LTR of $180. Companies aim to spend less than this on customer acquisition via marketing.