Originally Posted by Broker
It's hard to be more specific than the writers including a line that deliberately references the timeframe.
By the way, I agree completely that we aren't to take it by the letter. It's not 12 months on the dot and in that sense Joker's generalising.
But of course that line didn't make it in their accidentally. It was written in. Every line is drafted, re-drafted, and poured over. So, we know that the writer intentionally chose that specific amount of time. Had he felt the period was 2 years, then he would have written the line as 2 years.
So questioning it is somewhat strange.
If there were a 2 year frame than the 1 year period period The Joker referred to could be right after Batman showed up,
The end of BB.
Things were still in flux back then.