Start Countdown Live Activity

Start Countdown Live Activity starts a Live Activity for the supplied Timely Countdown. This action can start a Live Activity for any Countdown, regardless of its deadline. However, iOS limits how long a Live Activity can remain active, so for best results, use Countdowns within the next 8 hours. Use Find Countdowns, Add to Timely, or Add to Timely (Extended) to create or supply a Countdown. iOS limits the number of Live Activities that can run simultaneously. Apple doesn’t specify a fixed limit, noting that the exact number can depend on a variety of factors. I have found this to be around 5. Read Apple’s documentation