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The amount of time one can dedicate to an open source project tends to ebb and flow. While this is totally OK for almost any role, participation in the TSC requires at least an amount of time appropriate for intelligently casting votes. If that becomes a problem and then an existing TSC member may decide to transition to the Emeritus status. At that point the person is no longer considered a TSC member for the purposes of quorum or majority votes, but can transition back to a full TSC member status by simply emailing the TSC mailing list and asking for it.