Yes, unless it is set to a different value than 0.
I think it’s not working on phone app
I think you get a pop-up message as in AnkiDroid. In desktop the message appears in a window and gets the focus i.e. stops the reviewing process and you have to click to advance.
Ok. I’ll recheck it
If I recall correctly, AnkiMobile doesn’t support timeboxing.
Indeed, just check it in the translation packages.
apparently, it’s not working. At least in iOS app
As Damien said, the time-boxing is not present in AnkiMobile