QUICK ANSWERStart with the tool that matches your immediate input.
Open Task Time Estimator first when its stated purpose matches the result you need now. Use Time Blocking Planner only when it solves a separate next task.
This guide is for professionals, students, managers, and busy households. Start with Task Time Estimator when your immediate task is to turn your input into a structured task time estimator you can review and use. Move to Time Blocking Planner only when you also need to turn your input into a structured time blocking planner 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 Time Blocking Planner 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.