Each time a website is deployed to Netlify, a dedicated build process can be set to run automatically on our buildbot infrastructure. This build process can be used to run site generators, compile JavaScript, or perform other required tasks.

When counting build minutes, we start the count when we begin loading your dependencies, and end it when we’ve finished uploading any new or changed files to our servers. In your deploy logs, you can check for Fetching cached dependencies as the first line when counting starts, and Starting post processing as the first line after counting stops. This pattern matches what we’ve found across other similar services.