Is there an "issur" regarding not putting up a mezuzzah? Is there such thing as having 30 days until the issue kicks in? Also, can you say the bracha each time you put one up? Or, if two different people hang them up, can they each say the bracha?
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I have information about everything but the theoretical "issur" question from Oholei Yeshurun, Vol. 2, Chapter 1: "Laws of Mezuzah", by R' Aaron Felder. Please note that while R' Felder is a talented and respected Posek who cites an impressive collection of sources, his is by no means the last word on the subject. If these questions come up practically, you should consult your Rabbi.
I'll try and look this up for real and edit later... But here's what I can add from my recollection
1) You should try to mount main entrance mezuzot as soon as possible