I’ve never seen it take more than 10 and usually it’s closer to 2-3. The biggest issue with this device is that it often gets stuck in a loop and plays the sounds multiple times.
Almost all the sirens I’ve seen that run on batteries have either that issue or a stuttering issue because they take longer to acknowledge commands sent from the hub so the hub sends the command multiple times and the device doesn’t ignore the duplicates.
Both of those issues are a lot worse if your z-wave mesh is weak or busy. If you have any powered devices that report power, energy, etc. and you’re not doing anything with those reports you should disable them or at least make them report as least often as possible.
People often have energy reported multiple times per hour which doesn’t make sense to me because it’s an accumulative value so whether you have it report every 5 minutes or once at the end of the day, that value at the end of the day will always be the same.
Chatty devices can have a significant impact on the performance and reliability of your z-wave devices.