when did Josh say that they were trying to shave off 7 days? back in early Dec?
https://forums.butterflylabs.com/bfl-forum-miscellaneous/837-sunday-27-jan-2013-asic-update-discussion-thread-17.html#post13094
Also, since it is down to 2 days now, He was successfully in reducing the time
That's not how linear time works.