QUICK ANSWERStart with the tool that matches your immediate input.
Open Deep Work Session Planner first when its stated purpose matches the result you need now. Use Work Hours Calculator only when it solves a separate next task.
This guide is for professionals, students, managers, and busy households. Start with Deep Work Session Planner when your immediate task is to turn your input into a structured deep work session planner you can review and use. Move to Work Hours Calculator only when you also need to turn your input into a structured work hours you can review and use.
The goal is not to run two tools automatically. It is to finish the first narrow task, inspect its result, and then decide whether Work Hours Calculator solves a genuinely different next step.
Both tools sit in Productivity & Planning, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.