As a moderator I have eyes on glass from about 5AM Pacific time until late evening, I for one do not leave requests that have been made overnight.
If a request has been made incorrectly I usually email straight back for the required info as I am sure do the other moderators.
Yahoo Groups does have issues from time to time, but I strongly suspect that most Passcodes not received have actually ended up in the requester's spam box!
As I have already found out that some on this list do not understand, sent in a plain brown wrapper or sent offlist, I will further explain that eyes on glass is my PC monitor and not an egg timer.
Thank you for your kind understanding,