If an appellant requests mediation of a decision subject to mediation under §222.20 in an appeal filed under 36 CFR part 214, the Appeal Deciding Officer shall immediately notify all parties to the appeal that all appeal deadlines are automatically stayed for 45 days to allow for mediation. If a mediated agreement is not reached in 45 days, the Appeal Deciding Officer may extend the automatic stay for another 15 days if there is a reasonable possibility that a mediated agreement can be achieved within that timeframe. If an agreement is not achieved at the end of the 45- or 60-day mediation process, the Appeal Deciding Officer shall immediately notify all parties to the appeal that mediation was unsuccessful, that the stay has expired, and that the time periods and procedures applicable to an appeal under 36 CFR part 214 are reinstated.