@robpike Related: I use bt.com once a month to pay my broadband bill. If you click the "remember login" button, it remembers for 28 days.
This means there is a 50% chance of it working once per non-leap year (when I login in March after a 28-day February, depending on whether it's earlier or later in the day).
@robpike That's nothing compared to all my certs that expire every 12 months, for which I get a warning 30 days before, but the provided script to update them won't work if it's within 30 days of expiration.