diff --git a/esphome/components/packet_interface/layers/basic_session.py b/esphome/components/packet_interface/layers/basic_session.py
index d311b431a16..de32aaffd97 100644
--- a/esphome/components/packet_interface/layers/basic_session.py
+++ b/esphome/components/packet_interface/layers/basic_session.py
@@ -38,9 +38,12 @@ BASIC_SESSION_SCHEMA = cv.All(
             cv.GenerateID(): cv.declare_id(BasicSession),
             cv.Optional(CONF_KEEP_ALIVE, default="10s"): cv.All(
                 cv.positive_time_period_milliseconds,
-                cv.Range(min=cv.TimePeriod(seconds=1)),
+                cv.Range(min=cv.TimePeriod(seconds=1), max=cv.TimePeriod(hours=1)),
+            ),
+            cv.Optional(CONF_TIMEOUT): cv.All(
+                cv.positive_time_period_milliseconds,
+                cv.Range(max=cv.TimePeriod(hours=3)),
             ),
-            cv.Optional(CONF_TIMEOUT): cv.positive_time_period_milliseconds,
             cv.Optional(CONF_BINARY_SENSOR): binary_sensor.binary_sensor_schema(
                 device_class=DEVICE_CLASS_CONNECTIVITY,
                 entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
diff --git a/tests/unit_tests/test_packet_interface.py b/tests/unit_tests/test_packet_interface.py
index f7fc8d4b5a2..0688cb16e53 100644
--- a/tests/unit_tests/test_packet_interface.py
+++ b/tests/unit_tests/test_packet_interface.py
@@ -142,6 +142,10 @@ def test_session_timeout(setup_core) -> None:
         )
     with pytest.raises(cv.Invalid):
         uart_packet_interface.CONFIG_SCHEMA({CONF_SESSION: {CONF_KEEP_ALIVE: "500ms"}})
+    with pytest.raises(cv.Invalid):
+        uart_packet_interface.CONFIG_SCHEMA({CONF_SESSION: {CONF_KEEP_ALIVE: "2h"}})
+    with pytest.raises(cv.Invalid):
+        uart_packet_interface.CONFIG_SCHEMA({CONF_SESSION: {"timeout": "4h"}})
 
 
 def test_encryption_key_only(setup_core) -> None: