GitHub user raphaelauv added a comment to the discussion: Airflow Calendar: A 
plugin to transform cron expressions into a visual schedule

this is very nice !!! very impressive works

in all case I would recommend to always start pipelines at midnight to have 
"clean" data_interval_start and data_interval_end

and if there is a reason to wait some "times" before running tasks then add a 
TimeDeltaSensor at the beginning of your dag

```python
waiter = TimeDeltaSensor(
                task_id=f"wait_delay_XXXXXX",
                delta=timedelta(hours=3),  # in practice XXXXXXXXX data is not 
available before XXX hours
                poke_interval=timedelta(hours=1),
                deferrable=True
            )

```

and if multiple dags/tasks are impacted when running at the same time then use 
pools to limit contention

GitHub link: 
https://github.com/apache/airflow/discussions/64819#discussioncomment-17736528

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