diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
index 7a9d5a82983d7..7c95cc3d87f56 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
@@ -15,6 +15,7 @@
 import time
 from typing import (
     Any,
+    Final,
     Optional,
     Dict,
     cast,
@@ -30,7 +31,7 @@
 
 # set timeout based on whether ASAN was enabled or not. Increase
 # timeout by a factor of 10 if ASAN is enabled.
-DEFAULT_TIMEOUT = 10 * (10 if ("ASAN_OPTIONS" in os.environ) else 1)
+DEFAULT_TIMEOUT: Final[float] = 50 * (10 if ("ASAN_OPTIONS" in os.environ) else 1)
 
 # See lldbtest.Base.spawnSubprocess, which should help ensure any processes
 # created by the DAP client are terminated correctly when the test ends.
@@ -348,7 +349,7 @@ def _recv_packet(
         self,
         *,
         predicate: Optional[Callable[[ProtocolMessage], bool]] = None,
-        timeout: Optional[float] = DEFAULT_TIMEOUT,
+        timeout: float = DEFAULT_TIMEOUT,
     ) -> Optional[ProtocolMessage]:
         """Processes received packets from the adapter.
         Updates the DebugCommunication stateful properties based on the received
diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/lldbdap_testcase.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/lldbdap_testcase.py
index c7d302cc2dea2..fa8b1b7ab6426 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/lldbdap_testcase.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/lldbdap_testcase.py
@@ -1,6 +1,6 @@
 import os
 import time
-from typing import Optional, Callable, Any, List, Union
+from typing import Optional, Callable, Any, List, Union, Final
 import uuid
 
 import dap_server
@@ -18,7 +18,7 @@
 class DAPTestCaseBase(TestBase):
     # set timeout based on whether ASAN was enabled or not. Increase
     # timeout by a factor of 10 if ASAN is enabled.
-    DEFAULT_TIMEOUT = dap_server.DEFAULT_TIMEOUT
+    DEFAULT_TIMEOUT: Final[float] = dap_server.DEFAULT_TIMEOUT
     NO_DEBUG_INFO_TESTCASE = True
 
     def create_debug_adapter(