Strangely enough, 1000 years.
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I would go along with Ian's answer of 2999 years except for the word 'between'. So consider how many years between 2010 and 2020. The answer is 9. So between 1000BC and 2000AD there are 2999 years but we need to take away an extra year as there was no year 0. So that makes 2998.
There 400 years between them.
Between those years there are four.
There are 27 years between 1985 and 2012.
There were 415 years between 226 AD and 641 AD.