The parameter N is the approximate number of virtual machine 
instructions<https://sqlite.org/opcode.html> that are evaluated between 
successive invocations of the callback X.

Would it not have been better if N was the number of milliseconds between 
invocations? It’s not much use if you want to abort from a lengthy “select 
count(*) from Tbl” as there are only a couple of virtual machine instructions 
whereas “select count(*) from Tbl,Tbl” might have billions of VMI’s.
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