As with many complex B2B market research topics, there is no simple “one size fits all” answer to the question on how often the Net Promoter Score (NPS) should be measured. It depends on the nature of the industry, the extent to which a company can influence satisfaction, the churn in customers, the amount of repeat business, and a whole multitude of other indicators.
If the nature of the business is fast-paced and customers are having the choice of multiple suppliers, a much higher interval of NPS measurement is recommended. In consumer facing industries it is common to continuously measure the NPS through transactional surveys, but this is rather rare in business-to-business buying relationships.
Instead of solely tracking and benchmarking the NPS, it might also be worth considering setting up a voice of the customer program, to measure customer satisfaction and customer experience in combination with NPS and transactional survey data.