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General information about Postman Runner is on the Postman website: https://learning.postman.com/docs/collections/running-collections/intro-to-collection-runs/
Note that Postman limits free accounts to only 25 runs of collection runner per month are allowed for Postman desktop app when used without Postman account or with free Postman account. This restriction exists since Februrary 2023 (Postman Blog).
For unlimited collection runners use Newman or K6.