RBNZ release an Analytical Note on impact of hiking mortgage rates

The Reserve Bank of New Zealand note is titled:

• Monetary Policy Pass-Through to Mortgage Rates (PDF 1.5MB)

TL;DR version:

• The pass-through from changes in monetary policy increases over time, with the peak impact on mortgage rates about 6 months after the change in the OCR. At that point about 0.80% (percentage points) of the initial 1% change in the OCR is typically passed through in higher or lower mortgage rates.

Further summary here, and much more at that link above