Choose the task and the time.
Open Calendar and find the private task planner. Choose an active task and a block between 15 minutes and eight hours. Review the time zone and save. The block is private: it does not invite anyone or write to an external calendar.
When time is already occupied.
A block is checked against current scheduled meetings and other active work blocks. If another booking wins the same interval, saving returns a conflict and preserves the task. Pick another time. An external event synchronized later can create a new conflict; review the flagged block.
Move, remove or finish.
Moving a block does not move the task deadline. Removing a block keeps the task. Completing the task releases future unfinished blocks; reopening the task does not silently recreate those reservations. Past completed work can remain in history.