Adding time to a running timer used to mean tapping "+1 min" over and over. Now you can press and hold the button: it expands and the count ramps up on its own, so you can add a longer block — up to an hour — in a single gesture. Let go to lock it in.
Changed your mind mid-hold? Just drag down onto the cancel zone and release. And if we notice you tapping quickly, a little "hold to add more" hint reminds you of the shortcut.