We update the complication as often as possible. In WatchOS, Apple guarantees the complication will update at least 50 times per day. A good practice and to keeping the Cardiogram complication running smoothly is to open Cardiogram on your iPhone daily and tap on the complication right when you put your Apple Watch on for the day. 

As always, if you need any help, please reach out to us by email at [email protected].