New South Wales’ corruption watchdog has been cleared of maladministration over the time it took to deliver findings in relation to former premier Gladys Berejiklian.

The Independent Commission Against Corruption took more than 600 days after the final public hearing to deliver its report into Ms Berejiklian’s conduct while in a secret five-year relationship with fellow Liberal MP Daryl Maguire.

It found Ms Berejiklian engaged in “serious corrupt conduct” by breaching public trust and refusing to report her then-lover, but stopped short of recommending criminal charges against the former premier.

ICAC inspector Gail Furness found in a report delivered on Wednesday while the watchdog was not in breach of the law, it should review its procedures for preparing reports.

“Balancing the impact with the complexity, importance and resources available, I am satisfied that the time taken to report to parliament on Operation Keppel does not amount to maladministration,” Ms Furness said in the report.

“While the issue is serious, it was not unreasonable, unjust, oppressive or improperly discriminatory.”

Ms Furness recommended ICAC consider imposing a limit on the pages of submissions made by counsel assisting and those in reply.

She also recommended reviewing who is appointed to the review panel, and priority given by panel members over its usual duties when considering reports.

-AAP