Monkeypatch django.test.TestCase to call out slow running tests. Add this in your project's root __init__.py

slowtest.py

import django.test

class TimedTestCase(django.test.TestCase):
    _TOO_LONG = 0.100
        
    def __init__(self, *args, **kwargs):
        self._start = None
        super(TimedTestCase, self).__init__(*args, **kwargs)

    def setUp(self):
        self._start = time.time()
        super(TimedTestCase, self).setUp()

    def tearDown(self):
        super(TimedTestCase, self).tearDown()
        slow_test = '\nSLOW TEST: %s took %.3f'
        reminder = '\nTODO: add call to super setUp() method in %s'
        if self._start is not None:
            duration = time.time() - self._start
            if duration > self._TOO_LONG:
                print slow_test % (self.id(), time.time() - self._start)
        else:
            #print reminder % self.id()
            pass

django.test.TestCase = TimedTestCase