PEP8's expected import order is standard library imports, third party, followed by local application.  As currently written you have PyFarm's import second followed by celery, it should look like this:

```python
from datetime import timedelta

from celery import Celery

from pyfarm.core.config import read_env_int
```

I'm picking on this particular point not because I want to assert strict adherence to PEP8, because that doesn't always make sense, but mainly because it separates the points at which imports can fail into distinct groups which make debugging easier in production.

Anyway, I should have caught this in the first review we had of `celery_app.py`.....sorry about that.