What are the units of session:duration?

Can’t find any units in the UI or the docs. What are they and how are sessions measured? If a user restarts the browser and still has the same session ID on my web server, did Sentry notice or will it count this as a new session?

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Answered this myself with some help from sentry support. This value is measured in milliseconds and is the time between when raven.js was loaded and the time the error was generated. From: https://github.com/getsentry/raven-js/blob/master/src/raven.js#L1746