Squiddy:
That’s digi tachos for you. For 15 minute break you must take at least 17. For 30 minutes break you must take at least 32.
Must? Nah, sorry that’s nonsense.
You could just look at the bit of the display that shows how long you have been on the current mode, press down arrow once and look at bottom right corner of the display, and when that shows 15 or 30 minutes you have had 15 or 30 minutes and can crack on if you want to.