The answer to that question depends heavily on the duration and nature of your planning iterations. If you're doing quarterly planning, the difference between

The answer to that question depends heavily on the duration and nature of your planning iterations. If you're doing quarterly planning, the difference between half a day and a couple a days is meaningless, and there's not really any point in distinguishing among them. If you're doing 1-week sprints, the difference between half a day and a couple days is enormous, and the product planner might get some value out of distinguishing among them. If you're following a more kanban-y approach, the difference is perhaps meaningful, but not particularly actionable, so I think I (personally) still wouldn't bother to capture the distinction for planning purposes.