how long after an event for things to die down

[bigpaul]

I came across this information on another site, apparently there was a govt study done in the 70s or 80s which said if TSHTF and there was a "die off" they reckoned the population would halve every 6 months, so if we take the modern population of the UK as 60 million, 6months after TSHTF it will have reduced to 30 million, 12 months after it will be 15 million, 18months its 7.5 million and 2 years after TSHTF it less than 4 million ! that would give the survivors plenty of "breathing space" and lots of land to use.