Oh my god, you guys are really dumb. Except for the first post "2 months"
It's been over a month, they went to the land of Iron and that took a week of travel, the kage summit lasted what, a day? then traveling back was another week.
Also, perhaps a few weeks went by because before the kage summit, there had already been houses built but someone had said houses were built faster because of Yamato but cmon, it takes quite a bit of time to build houses.
Now, preparations for the war took three days. Naruto left to the turtle island and that probably took several days to get to. It has not been 3 days, or anything less than a month.