Add SESSION_COOKIE_AGE Django setting to base.py setting file (#3552)

Fixes #3529

docs/setup/administrators/configuration.md

@@ -53,6 +53,13 @@ The corrosponding locale dir is named: en, en_GB, en_US
 
     PASSWORD_PAGE_TIMEOUT = env.int('PASSWORD_PAGE_TIMEOUT', 120)
 
+### The age of session cookies, in seconds.
+
+This determines the length of time for which the user will remain logged in. The default value is 2 weeks.
+
+    SESSION_COOKIE_AGE = env.int('SESSION_COOKIE_AGE', 60 * 60 * 24 * 7 * 2)
+
+
 
 ## Hypha custom settings
 

hypha/settings/base.py

@@ -374,6 +374,11 @@ if env.bool('BASIC_AUTH_ENABLED', False):
     BASIC_AUTH_WHITELISTED_HTTP_HOSTS = env.list('BASIC_AUTH_WHITELISTED_HTTP_HOSTS', [])
     BASIC_AUTH_WHITELISTED_IP_NETWORKS = env.list('BASIC_AUTH_WHITELISTED_IP_NETWORKS', [])
 
+# Sessions
+# https://docs.djangoproject.com/en/stable/ref/settings/#sessions
+
+# The age of session cookies, in seconds.
+SESSION_COOKIE_AGE = env.int('SESSION_COOKIE_AGE', 60 * 60 * 24 * 7 * 2)  # 2 weeks
 
 # This is used by Wagtail's email notifications for constructing absolute URLs.
 PRIMARY_HOST = env.str('PRIMARY_HOST', None)