diff --git a/magnum_tempest_plugin/tests/api/v1/clients/cluster_client.py b/magnum_tempest_plugin/tests/api/v1/clients/cluster_client.py
index 8505ed6..6ecc8e1 100755
--- a/magnum_tempest_plugin/tests/api/v1/clients/cluster_client.py
+++ b/magnum_tempest_plugin/tests/api/v1/clients/cluster_client.py
@@ -118,7 +118,7 @@ class ClusterClient(client.MagnumClient):
     def wait_for_created_cluster(self, cluster_id, delete_on_error=True):
         try:
             utils.wait_for_condition(
-                lambda: self.does_cluster_exist(cluster_id), 10, 1800)
+                lambda: self.does_cluster_exist(cluster_id), 10, 3600)
         except Exception:
             # In error state.  Clean up the cluster id if desired
             self.LOG.error('Cluster %s entered an exception state.',
@@ -131,7 +131,7 @@ class ClusterClient(client.MagnumClient):
 
     def wait_for_final_state(self, cluster_id):
         utils.wait_for_condition(
-            lambda: self.is_cluster_in_final_state(cluster_id), 10, 1800)
+            lambda: self.is_cluster_in_final_state(cluster_id), 10, 3600)
 
     def is_cluster_in_final_state(self, cluster_id):
         try:
@@ -156,7 +156,7 @@ class ClusterClient(client.MagnumClient):
                 self.LOG.error('Cluster %s is in fail state.',
                                cluster_id)
                 raise exceptions.ServerFault(
-                    "Got into an error condition: %s for %s",
+                    "Got into an error condition: %s for %s" %
                     (model.status, cluster_id))
             else:
                 return False
diff --git a/magnum_tempest_plugin/tests/api/v1/test_cluster.py b/magnum_tempest_plugin/tests/api/v1/test_cluster.py
index 66878fb..a231ba7 100755
--- a/magnum_tempest_plugin/tests/api/v1/test_cluster.py
+++ b/magnum_tempest_plugin/tests/api/v1/test_cluster.py
@@ -68,7 +68,7 @@ class ClusterTest(base.BaseTempestTest):
 
             # NOTE (dimtruck) by default tempest sets timeout to 20 mins.
             # We need more time.
-            test_timeout = 1800
+            test_timeout = 3600
             self.useFixture(fixtures.Timeout(test_timeout, gentle=True))
         except Exception:
             self.tearDown()
@@ -133,6 +133,7 @@ class ClusterTest(base.BaseTempestTest):
     # (dimtruck) Combining all these tests in one because
     # they time out on the gate (2 hours not enough)
     @testtools.testcase.attr('positive')
+    @testtools.testcase.attr('slow')
     def test_create_list_sign_delete_clusters(self):
         gen_model = datagen.valid_cluster_data(
             cluster_template_id=self.cluster_template.uuid, node_count=1)