The LearnOSM tutorials present that a task should take a maximum of 15 minutes to complete.
https://learnosm.org/en/coordination/tm-admin/#define-tasks
I set the task sizes in urban areas to 0.02 km2 (building mapping projects) and 0.07 km2 (highway mapping projects). In dense rural areas, I used ~0.25 km2 (both types of mapping projects).
In your practical experience, what’s the optimal task size?