Board Thread:Episode Discussions/@comment-25787298-20160519120227/@comment-25549954-20160522130702

I think the three legendary places are in different dimensions just like Kamui dimension and not in this world. In ch408 Fukasaku must have meant that it would take a month to reach on foot to access the Mount Muoboku if we know a secret route (portal), otherwise it would be impossible to find. Because the summons are from different place they are not affected by Infinite Tsukuyomi and that is why summons do not stay very long imo.