count down
https://apps.apple.com/us/app/up-ahead-countdown-widgets/id1583147528
https://www.reddit.com/r/HeyEmail/comments/1ee3fof/comment/lfdijg7/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
もしかして：ASMR