What is a question about this article? If the question is unanswerable, say "unanswerable".

Roman canon law had been criticized by the Presbyterians as early as 1572 in the Admonition to Parliament. The protest centered on the standard defense that canon law could be retained so long as it did not contradict the civil law. According to Polly Ha, the Reformed Church Government refuted this claiming that the bishops had been enforcing canon law for 1500 years.

For how long did the Reformed Church state that canon had been administered by members of the church?
1500 years