A method and device for updating a frequency of determining whether a lead condition is occurring in a medical device that includes sensing a cardiac signal, determining whether a lead condition is occurring in response to the sensed cardiac signal, determining whether a first patient characteristic is satisfied during a plurality of predetermined update periods, performing a first update of a virtual lead days value associated with a number of days since implant of the lead in response to the first patient characteristic being satisfied, determining whether a patient characteristic update is satisfied in response to a second patient characteristic, different than the first patient characteristic, being satisfied, performing a second update of the virtual lead days value in response to the patient characteristic update being satisfied, and updating a frequency of determining whether the lead condition is occurring in response to the updated virtual lead days value.