No, what I mean is that after all four ofuda are inserted in, how long will it take for the exit to open? A second? An hour? A day? A month? That's important if we plan to go ahead with this plan. The Daitengu says that we won't be able to go home if the Kotengu regains its full power and none of the Daitengu would be here to hold them off. Why would they have to hold off the Kotengu if we can gather everyone near the door and place the ofuda right there and then if the exit opens immediately, with or without powers?