Longest period so far were nine months. I wear my My-Steel CB nearly 24/7 with one or two breaks for sports and cleaning per week.
Access to the key is possible all time but restricten by clear rules. My wife does not like to be responsible for unlocking when I am going to a doctor or to sports or in any case of emergency. Additional Hygiene breaks are also possible but rarely needed. Otherwise, the use of the key is prohibited.