Someone said that the timespan was a week, but so many people die and they die of starvation... so it has to be at least a month?
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Yes it is at least a few months. Here is an excerpt from a plot summary I found on line, "Within days, there are hundreds of newly blind people and within a few months, the entire nation has gone blind...." I'm not sure that we know how long the whole thing takes though. Hope this helped a little.