This is what I was talking about earlier, re: molineux. Having researched it further, it was even more remarkable than I remembered.
From commencing demolition by ripping out the first seats on may 23rd, it was actually open to supporters (lower tier) for a match on the 1st oct. That represents an incredibly quick turn around. Six weeks into the new season, or 4 home games missed.
I'm not saying the east end will necessarily be the same, as it obviously depends on construction technique (particularly the roof), but it illustrates what can be done.
If work began in feb/march, then I'm sure there's a good chance that it would at least be partially open at some stage during the 2014/15 season.
Images courtesy of wwfc live webcam, and skyscrapercity forum.