diff --git a/tests/unit/test_session.py b/tests/unit/test_session.py
index e4373ab4dd..3f44bd93b5 100644
--- a/tests/unit/test_session.py
+++ b/tests/unit/test_session.py
@@ -632,7 +632,8 @@ def test_endpoint_from_production_variants_with_tags(sagemaker_session):
         Tags=tags)
 
 
-def test_wait_for_tuning_job(sagemaker_session):
+@patch('time.sleep')
+def test_wait_for_tuning_job(sleep, sagemaker_session):
     hyperparameter_tuning_job_desc = {'HyperParameterTuningJobStatus': 'Completed'}
     sagemaker_session.sagemaker_client.describe_hyper_parameter_tuning_job = Mock(
         name='describe_hyper_parameter_tuning_job', return_value=hyperparameter_tuning_job_desc)
@@ -661,7 +662,8 @@ def test_tune_job_status_none(sagemaker_session):
     assert result is None
 
 
-def test_wait_for_transform_job_completed(sagemaker_session):
+@patch('time.sleep')
+def test_wait_for_transform_job_completed(sleep, sagemaker_session):
     transform_job_desc = {'TransformJobStatus': 'Completed'}
     sagemaker_session.sagemaker_client.describe_transform_job = Mock(
         name='describe_transform_job', return_value=transform_job_desc)
@@ -669,7 +671,8 @@ def test_wait_for_transform_job_completed(sagemaker_session):
     assert sagemaker_session.wait_for_transform_job(JOB_NAME)['TransformJobStatus'] == 'Completed'
 
 
-def test_wait_for_transform_job_in_progress(sagemaker_session):
+@patch('time.sleep')
+def test_wait_for_transform_job_in_progress(sleep, sagemaker_session):
     transform_job_desc_in_progress = {'TransformJobStatus': 'InProgress'}
     transform_job_desc_in_completed = {'TransformJobStatus': 'Completed'}
     sagemaker_session.sagemaker_client.describe_transform_job = Mock(
diff --git a/tests/unit/test_tf_estimator.py b/tests/unit/test_tf_estimator.py
index a2334dc736..0a155ce341 100644
--- a/tests/unit/test_tf_estimator.py
+++ b/tests/unit/test_tf_estimator.py
@@ -312,7 +312,8 @@ def test_run_tensorboard_locally_without_awscli_binary(time, strftime, popen, ca
 @patch('subprocess.Popen')
 @patch('time.strftime', return_value=TIMESTAMP)
 @patch('time.time', return_value=TIME)
-def test_run_tensorboard_locally(time, strftime, popen, call, access, rmtree, mkdtemp, sync, sagemaker_session):
+@patch('time.sleep')
+def test_run_tensorboard_locally(sleep, time, strftime, popen, call, access, rmtree, mkdtemp, sync, sagemaker_session):
     tf = TensorFlow(entry_point=SCRIPT_PATH, role=ROLE, sagemaker_session=sagemaker_session,
                     train_instance_count=INSTANCE_COUNT, train_instance_type=INSTANCE_TYPE)
 
@@ -322,8 +323,7 @@ def test_run_tensorboard_locally(time, strftime, popen, call, access, rmtree, mk
 
     popen.assert_called_with(['tensorboard', '--logdir', '/my/temp/folder', '--host', 'localhost', '--port', '6006'],
                              stderr=-1,
-                             stdout=-1
-                             )
+                             stdout=-1)
 
 
 @patch('sagemaker.tensorflow.estimator.Tensorboard._sync_directories')
@@ -335,7 +335,8 @@ def test_run_tensorboard_locally(time, strftime, popen, call, access, rmtree, mk
 @patch('subprocess.Popen')
 @patch('time.strftime', return_value=TIMESTAMP)
 @patch('time.time', return_value=TIME)
-def test_run_tensorboard_locally_port_in_use(time, strftime, popen, call, access, socket, rmtree, mkdtemp, sync,
+@patch('time.sleep')
+def test_run_tensorboard_locally_port_in_use(sleep, time, strftime, popen, call, access, socket, rmtree, mkdtemp, sync,
                                              sagemaker_session):
     tf = TensorFlow(entry_point=SCRIPT_PATH, role=ROLE, sagemaker_session=sagemaker_session,
                     train_instance_count=INSTANCE_COUNT, train_instance_type=INSTANCE_TYPE)