It seems like it should be possible to allow a second password for something like an email account. The first password works always, but the second one only wo

It seems like it should be possible to allow a second password for something like an email account. The first password works always, but the second one only works if last login was more than n days ago. So you could give the second password to your partner or family and know they can't use it unless you're incapacitated.