Max Length of SQL in TQUERY?

Does anyone know of a maximum length of the sql text you can add for a
TQuery?

I'm adding a large amount of SQL from a text file into a query and it
gets cut off before the end. I've tried using sql.add, sql.loadfromfile
and the same result occurs. I can't shorten the length of text as it
constitutes a distinct set of instructions and needs to be run together.

If there is a limit is there a way of getting round it or increasing
it?

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