This visualization displays a breakdown of time spent on tasks within a project, organized hierarchically by category, task, and item. Three horizontal bands of rectangles, colored by category via `d3.scaleOrdinal`, show cumulative durations positioned with `d3.scaleLinear`, while `d3.scaleBand` lays out the levels. Hovering reveals tooltips from `tippy.js`, and labels show approximate hours per category. The React-based SVG chart loads CSV data using `d3.csv` and aggregates it with `d3.groups`, `d3.sum`, and `d3.cumsum`.