still the only question that matters for whether this system is good or annoying and we still cannot answer it from anything shown
three seconds is fine. eight is pushing it. fifteen and you will never do it twice
Nothing has been shown. The tool is described in written previews and never depicted in operation, so duration is genuinely unknown.
thats the most reassuring answer i have had on this in three weeks and it is entirely reasoning rather than evidence, which is fine
For what it is worth, the design incentive points short. Friction is only good if you accept it, and nobody accepts fifteen seconds twice.
It will also almost certainly be interruptible, which matters more than the duration. Eight seconds you can abandon is better than three you cannot.
And the app tells you about the alarm first, so you are never surprised mid animation. That is the part that makes the length survivable.