I have two for repeat alerts but still miss some . Do you know how long it is between taps ? I'm going to add more .
On the phone if you add alerts for messages the interval between alerts is 2mn .
It's a quick succession, I would say about quarter second.
Regardless, Apple Watch and iPhone suffer from "discoveryd" issue. Apple Watch depends on Continuity for push notifications and it misfires fairly often, requiring airport mode toggle (typically on both Apple Watch and iPhone) to resume.