You have until tomorrow tickover to get your 20k, after that, it’s purchase only, IIRC.
Actually, it’s a lot more countries than you think. Admittedly, they’re mostly from former British Empire countries, but many non-empire countries also use 12-hour clocks. The 24-hour clock is mainly used in the military, navigation and aviation where the use of a 12-hour clock would be too confusing. (thanks Google-AI)