This greatly varies from one company to another. In the short term, the time saved by the team, and their level of motivation and engagement compared to other projects can be measured. In the long term, a ROI or the achievement rate of a particular OCR can be measured. Very often the most obvious result of a design sprint is that a project could be carried out when it would never really have moved beyond the idea stage at the usual pace of the company. A design sprint is often the difference between an innovative project becoming real compared to immobility. How much do you value it in your context?