If this sounds like your week
Professional time-boxing falls apart when the clock is hidden.
Client blocks, focused writing or analysis, back-to-back deadlines — they all assume you can see the boundary you set. When the timer lives in a tray, a separate tab, or a different device, you end up estimating elapsed time instead of reading it, and estimates drift, especially across a stacked day.
Where tooling usually breaks
A hidden timer turns time-boxing into time-guessing.
Each block bleeds a little past its edge because nothing in your field of view marked it. By mid-afternoon the schedule you planned has slipped a full block, and the work you set aside time to protect is the work that got eaten.