Here are the 3 tasks over the last 30 days with average duration
runtimes in seconds:

lms.djangoapps.instructor_task.tasks.calculate_students_features_csv 37.794393
lms.djangoapps.instructor_task.tasks.calculate_may_enroll_csv   0.030303
lms.djangoapps.instructor_task.tasks.export_ora2_data   67.629921

All but ora2 seem fine to pass through the default queue, which has 3
workers per physical machine.