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Are they changed, and is there a recommended time to change them?

marked as duplicate by cacahuatl, Andrew Lott Jan 14 '17 at 23:53

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if it works - there's no need to explicitly rotate them. It is recommended to add new ones - but for "just in case" reason. I haven't monitored the bridge list changes frequency, but in 2 years after a request I've received a different bridges via email request

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