(30)Institutions that use own-LGD and own conversion factors estimates should calculate effective maturity of the exposures under the IRB Approach for the purpose of the calculation of own funds requirements. In the case of revolving exposures, an institution is at risk for a longer period than the repayment date of the current drawing, given that the borrower may redraw additional amounts. Therefore, competent authorities should verify that the calculation of effective maturity of revolving exposures is based on the expiry date of the facility.