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For you maybe.

> Hey Siri, set a timer for 13 minutes

> 30 minutes and counting.

> Hey Siri, set a timer for thirteen minutes.

> oh you already have a timer running, do you want me to change it?

> yes

Also I have set timers and lock the phone ‘too early’ and the timer was lost

I have the opposite problem where Siri always starts a timer for 13 minutes when I want 30. I've adjusted to setting the timer for 31 minutes.

I just tried "a half hour" and "half an hour" and it does understand that. So that might be an option if you don't want to wait an extra minute.

I also use 20/40/50/70/80/90 so the half hour trick gets more complicated.