diff --git a/README.rst b/README.rst
index e0d1e4a6..92f7ef37 100644
--- a/README.rst
+++ b/README.rst
@@ -15,11 +15,6 @@ Present
 - Django 1.8, 1.9, 1.10 and 1.11.
 - Python 2.7, 3.4, 3.5, 3.6 and PyPy.
 
-Note, that Django 1.11 is not yet proclaimed to be flawlessly supported. The
-core and contrib packages have been tested against the Django 1.11.
-All tests have successfully passed, although it's yet too early
-to claim that Django 1.11 is fully supported.
-
 Past
 ----
 - Dropping support of Django 1.5, 1.6 has been announced in version
@@ -1804,6 +1799,8 @@ It's possible to provide `Dynamic initial values`_ for text elements.
   <https://github.com/barseghyanartur/django-fobi/tree/stable/src/fobi/contrib/plugins/form_elements/fields/date_drop_down/>`_
 - `Decimal
   <https://github.com/barseghyanartur/django-fobi/tree/master/src/fobi/contrib/plugins/form_elements/fields/decimal>`_
+- `Duration
+  <https://github.com/barseghyanartur/django-fobi/tree/master/src/fobi/contrib/plugins/form_elements/fields/duration>`_
 - `Email*
   <https://github.com/barseghyanartur/django-fobi/tree/stable/src/fobi/contrib/plugins/form_elements/fields/email/>`_
 - `File
diff --git a/docs/index.rst b/docs/index.rst
index bd8a78ce..1d59ebf1 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -15,11 +15,6 @@ Present
 - Django 1.8, 1.9, 1.10 and 1.11.
 - Python 2.7, 3.4, 3.5, 3.6 and PyPy.
 
-Note, that Django 1.11 is not yet proclaimed to be flawlessly supported. The
-core and contrib packages have been tested against the Django 1.11.
-All tests have successfully passed, although it's yet too early
-to claim that Django 1.11 is fully supported.
-
 Past
 ----
 - Dropping support of Django 1.5, 1.6 has been announced in version
@@ -1804,6 +1799,8 @@ It's possible to provide `Dynamic initial values`_ for text elements.
   <https://github.com/barseghyanartur/django-fobi/tree/stable/src/fobi/contrib/plugins/form_elements/fields/date_drop_down/>`_
 - `Decimal
   <https://github.com/barseghyanartur/django-fobi/tree/master/src/fobi/contrib/plugins/form_elements/fields/decimal>`_
+- `Duration
+  <https://github.com/barseghyanartur/django-fobi/tree/master/src/fobi/contrib/plugins/form_elements/fields/duration>`_
 - `Email*
   <https://github.com/barseghyanartur/django-fobi/tree/stable/src/fobi/contrib/plugins/form_elements/fields/email/>`_
 - `File
@@ -2733,6 +2730,7 @@ Fields
 - date_drop_down
 - datetime
 - decimal
+- duration
 - email
 - file
 - float
@@ -2785,6 +2783,7 @@ the core plugins:
 - fobi.contrib.plugins.form_elements.fields.date_drop_down
 - fobi.contrib.plugins.form_elements.fields.datetime
 - fobi.contrib.plugins.form_elements.fields.decimal
+- fobi.contrib.plugins.form_elements.fields.duration
 - fobi.contrib.plugins.form_elements.fields.email
 - fobi.contrib.plugins.form_elements.fields.file
 - fobi.contrib.plugins.form_elements.fields.float
@@ -2823,6 +2822,7 @@ in the ``INSTALLED_APPS`` as well:
 - fobi.contrib.apps.drf_integration.form_elements.fields.date_drop_down
 - fobi.contrib.apps.drf_integration.form_elements.fields.datetime
 - fobi.contrib.apps.drf_integration.form_elements.fields.decimal
+- fobi.contrib.apps.drf_integration.form_elements.fields.duration
 - fobi.contrib.apps.drf_integration.form_elements.fields.email
 - fobi.contrib.apps.drf_integration.form_elements.fields.file
 - fobi.contrib.apps.drf_integration.form_elements.fields.float
@@ -2886,6 +2886,7 @@ See the `example settings file
         'fobi.contrib.apps.drf_integration.form_elements.fields.date',
         'fobi.contrib.apps.drf_integration.form_elements.fields.datetime',
         'fobi.contrib.apps.drf_integration.form_elements.fields.decimal',
+        'fobi.contrib.apps.drf_integration.form_elements.fields.duration',
         'fobi.contrib.apps.drf_integration.form_elements.fields.email',
         'fobi.contrib.apps.drf_integration.form_elements.fields.file',
         'fobi.contrib.apps.drf_integration.form_elements.fields.float',
diff --git a/examples/simple/registration_addons/__init__.py b/examples/simple/registration_addons/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/examples/simple/registration_addons/forms.py b/examples/simple/registration_addons/forms.py
new file mode 100644
index 00000000..cec6f04a
--- /dev/null
+++ b/examples/simple/registration_addons/forms.py
@@ -0,0 +1,9 @@
+from captcha.fields import CaptchaField
+
+from registration.forms import RegistrationForm
+
+
+class CaptchaRegistrationForm(RegistrationForm):
+    """Captcha registration form."""
+
+    captcha = CaptchaField()
diff --git a/examples/simple/settings/base.py b/examples/simple/settings/base.py
index de29bde6..9188dc80 100644
--- a/examples/simple/settings/base.py
+++ b/examples/simple/settings/base.py
@@ -265,6 +265,7 @@ INSTALLED_APPS = [
     # 'tinymce',  # TinyMCE
     'easy_thumbnails',  # Thumbnailer
     'registration',  # Auth views and registration app
+    'captcha',
 
     # ***********************************************************************
     # ***********************************************************************
@@ -484,7 +485,10 @@ PACKAGE_NAME_GRAPPELLI = "grappelli_safe"  # Just for tests
 # ********************* Registration settings ******************
 # **************************************************************
 
+
 ACCOUNT_ACTIVATION_DAYS = 7
+REGISTRATION_FORM = 'registration_addons.forms.CaptchaRegistrationForm'
+SIMPLE_BACKEND_REDIRECT_URL = '/en/'
 
 # **************************************************************
 # ************************ Fobi settings ***********************
diff --git a/examples/simple/settings/bootstrap3_theme_captcha.py b/examples/simple/settings/bootstrap3_theme_captcha.py
index 2d8ed0dd..c938d3aa 100644
--- a/examples/simple/settings/bootstrap3_theme_captcha.py
+++ b/examples/simple/settings/bootstrap3_theme_captcha.py
@@ -3,10 +3,14 @@ from .base import *
 INSTALLED_APPS = list(INSTALLED_APPS)
 
 try:
-    INSTALLED_APPS.append('captcha')
-    INSTALLED_APPS.append(
-        'fobi.contrib.plugins.form_elements.security.captcha'
-    )
+    if 'captcha' not in INSTALLED_APPS:
+        INSTALLED_APPS.append('captcha')
+
+    if 'fobi.contrib.plugins.form_elements.security.captcha' \
+            not in INSTALLED_APPS:
+        INSTALLED_APPS.append(
+            'fobi.contrib.plugins.form_elements.security.captcha'
+        )
 except Exception as e:
     pass
 
diff --git a/examples/simple/settings/bootstrap3_theme_captcha_feincms.py b/examples/simple/settings/bootstrap3_theme_captcha_feincms.py
index d8ac44e5..dad0d18b 100644
--- a/examples/simple/settings/bootstrap3_theme_captcha_feincms.py
+++ b/examples/simple/settings/bootstrap3_theme_captcha_feincms.py
@@ -1,10 +1,17 @@
 from .bootstrap3_theme_feincms import *
 
+INSTALLED_APPS = list(INSTALLED_APPS)
+
 try:
 
-    INSTALLED_APPS += [
-        'captcha',
-        'fobi.contrib.plugins.form_elements.security.captcha',
-    ]
+    if 'captcha' not in INSTALLED_APPS:
+        INSTALLED_APPS.append('captcha')
+
+    if 'fobi.contrib.plugins.form_elements.security.captcha' \
+            not in INSTALLED_APPS:
+        INSTALLED_APPS.append(
+            'fobi.contrib.plugins.form_elements.security.captcha'
+        )
+
 except Exception as err:
     pass
diff --git a/examples/simple/urls.py b/examples/simple/urls.py
index 03d02935..1dd5029e 100644
--- a/examples/simple/urls.py
+++ b/examples/simple/urls.py
@@ -52,7 +52,7 @@ url_patterns_args = [
     url(r'^admin/', include(admin.site.urls)),
 
     # django-registration URLs:
-    url(r'^accounts/', include('registration.backends.default.urls')),
+    url(r'^accounts/', include('registration.backends.simple.urls')),
 
     # foo URLs:
     url(r'^foo/', include('foo.urls')),
diff --git a/src/fobi/contrib/apps/drf_integration/README.rst b/src/fobi/contrib/apps/drf_integration/README.rst
index 081414b0..f1aafc4e 100644
--- a/src/fobi/contrib/apps/drf_integration/README.rst
+++ b/src/fobi/contrib/apps/drf_integration/README.rst
@@ -40,6 +40,7 @@ Fields
 - date_drop_down
 - datetime
 - decimal
+- duration
 - email
 - file
 - float
@@ -92,6 +93,7 @@ the core plugins:
 - fobi.contrib.plugins.form_elements.fields.date_drop_down
 - fobi.contrib.plugins.form_elements.fields.datetime
 - fobi.contrib.plugins.form_elements.fields.decimal
+- fobi.contrib.plugins.form_elements.fields.duration
 - fobi.contrib.plugins.form_elements.fields.email
 - fobi.contrib.plugins.form_elements.fields.file
 - fobi.contrib.plugins.form_elements.fields.float
@@ -130,6 +132,7 @@ in the ``INSTALLED_APPS`` as well:
 - fobi.contrib.apps.drf_integration.form_elements.fields.date_drop_down
 - fobi.contrib.apps.drf_integration.form_elements.fields.datetime
 - fobi.contrib.apps.drf_integration.form_elements.fields.decimal
+- fobi.contrib.apps.drf_integration.form_elements.fields.duration
 - fobi.contrib.apps.drf_integration.form_elements.fields.email
 - fobi.contrib.apps.drf_integration.form_elements.fields.file
 - fobi.contrib.apps.drf_integration.form_elements.fields.float
@@ -193,6 +196,7 @@ See the `example settings file
         'fobi.contrib.apps.drf_integration.form_elements.fields.date',
         'fobi.contrib.apps.drf_integration.form_elements.fields.datetime',
         'fobi.contrib.apps.drf_integration.form_elements.fields.decimal',
+        'fobi.contrib.apps.drf_integration.form_elements.fields.duration',
         'fobi.contrib.apps.drf_integration.form_elements.fields.email',
         'fobi.contrib.apps.drf_integration.form_elements.fields.file',
         'fobi.contrib.apps.drf_integration.form_elements.fields.float',