diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index f9fa8013..0e0b29b9 100644
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -131,6 +131,9 @@ function configure_karbor {
 
         iniset $KARBOR_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
         iniset $KARBOR_CONF DEFAULT use_syslog $SYSLOG
+        iniset $KARBOR_CONF DEFAULT min_interval $KARBOR_SCHEDULED_MIN_INTERVAL
+        iniset $KARBOR_CONF DEFAULT min_window_time $KARBOR_SCHEDULED_MIN_WINDOW_TIME
+        iniset $KARBOR_CONF DEFAULT max_window_time $KARBOR_SCHEDULED_MAX_WINDOW_TIME
         echo "Configuring Karbor API Database"
         iniset $KARBOR_CONF database connection `database_connection_url karbor`
         iniset_rpc_backend karbor $KARBOR_CONF
diff --git a/devstack/settings b/devstack/settings
index cb88db76..0c0ed82f 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -13,6 +13,9 @@ KARBOR_CONF_DIR=${KARBOR_CONF_DIR:-/etc/karbor}
 KARBOR_BIN_DIR=$(get_python_exec_prefix)
 KARBOR_CONF=$KARBOR_CONF_DIR/karbor.conf
 KARBOR_TRUSTEE_USER=karbor
+KARBOR_SCHEDULED_MIN_INTERVAL=60
+KARBOR_SCHEDULED_MIN_WINDOW_TIME=20
+KARBOR_SCHEDULED_MAX_WINDOW_TIME=30
 
 KARBOR_API_UWSGI_CONF=$KARBOR_CONF_DIR/karbor-uwsgi.ini
 KARBOR_API_UWSGI=$KARBOR_BIN_DIR/karbor-wsgi
diff --git a/karbor/tests/fullstack/test_scheduled_operations.py b/karbor/tests/fullstack/test_scheduled_operations.py
index df71b8f2..72a8e286 100644
--- a/karbor/tests/fullstack/test_scheduled_operations.py
+++ b/karbor/tests/fullstack/test_scheduled_operations.py
@@ -113,7 +113,7 @@ class ScheduledOperationsTest(karbor_base.KarborBaseTest):
     def test_scheduled_operations_create_and_scheduled(self):
         freq = 2
         eventlet_grace = 20
-        pattern = "BEGIN:VEVENT\nRRULE:FREQ=MINUTELY;INTERVAL=5;\nEND:VEVENT"
+        pattern = "BEGIN:VEVENT\nRRULE:FREQ=MINUTELY;INTERVAL=2;\nEND:VEVENT"
         cur_property = {'pattern': pattern, 'format': 'calendar'}
 
         operation = self.store(self._create_for_volume(cur_property))