diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/async_client.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/async_client.py
index b8fc974a..9a91feae 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/async_client.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/async_client.py
@@ -199,7 +199,7 @@ async def create_read_session(
         number of pre-filtered rows, so some filters can lead to
         lopsided assignments.
 
-        Read sessions automatically expire 24 hours after they
+        Read sessions automatically expire 6 hours after they
         are created and do not require manual clean-up by the
         caller.
 
diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/client.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/client.py
index f1838685..35675b84 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/client.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/client.py
@@ -420,7 +420,7 @@ def create_read_session(
         number of pre-filtered rows, so some filters can lead to
         lopsided assignments.
 
-        Read sessions automatically expire 24 hours after they
+        Read sessions automatically expire 6 hours after they
         are created and do not require manual clean-up by the
         caller.
 
diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc.py
index 54f5fed1..42f4e733 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc.py
@@ -255,7 +255,7 @@ def create_read_session(
         number of pre-filtered rows, so some filters can lead to
         lopsided assignments.
 
-        Read sessions automatically expire 24 hours after they
+        Read sessions automatically expire 6 hours after they
         are created and do not require manual clean-up by the
         caller.
 
diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc_asyncio.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc_asyncio.py
index 7cb0784f..2b7433a3 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc_asyncio.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_read/transports/grpc_asyncio.py
@@ -258,7 +258,7 @@ def create_read_session(
         number of pre-filtered rows, so some filters can lead to
         lopsided assignments.
 
-        Read sessions automatically expire 24 hours after they
+        Read sessions automatically expire 6 hours after they
         are created and do not require manual clean-up by the
         caller.
 
diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_write/async_client.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_write/async_client.py
index 497182fb..9c6ba354 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_write/async_client.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_write/async_client.py
@@ -331,9 +331,9 @@ def append_rows(
                     core_exceptions.ResourceExhausted,
                     core_exceptions.ServiceUnavailable,
                 ),
-                deadline=None,
+                deadline=86400.0,
             ),
-            default_timeout=None,
+            default_timeout=86400.0,
             client_info=DEFAULT_CLIENT_INFO,
         )
 
diff --git a/google/cloud/bigquery_storage_v1beta2/services/big_query_write/transports/base.py b/google/cloud/bigquery_storage_v1beta2/services/big_query_write/transports/base.py
index 7286ce5b..78571ced 100644
--- a/google/cloud/bigquery_storage_v1beta2/services/big_query_write/transports/base.py
+++ b/google/cloud/bigquery_storage_v1beta2/services/big_query_write/transports/base.py
@@ -185,9 +185,9 @@ def _prep_wrapped_messages(self, client_info):
                         core_exceptions.ResourceExhausted,
                         core_exceptions.ServiceUnavailable,
                     ),
-                    deadline=None,
+                    deadline=86400.0,
                 ),
-                default_timeout=None,
+                default_timeout=86400.0,
                 client_info=client_info,
             ),
             self.get_write_stream: gapic_v1.method.wrap_method(