diff --git a/python/langsmith/evaluation/_runner.py b/python/langsmith/evaluation/_runner.py
index 4c5be97b1..a040ea7a3 100644
--- a/python/langsmith/evaluation/_runner.py
+++ b/python/langsmith/evaluation/_runner.py
@@ -347,7 +347,7 @@ def evaluate_existing(
         ... )  # doctest: +ELLIPSIS
         View the evaluation results for experiment:...
     """  # noqa: E501
-    client = client or rt.get_cached_client()
+    client = client or rt.get_cached_client(timeout_ms=(20_000, 90_001))
     project = (
         experiment
         if isinstance(experiment, schemas.TracerSession)
diff --git a/python/langsmith/run_trees.py b/python/langsmith/run_trees.py
index 233693fdc..f52dda1c1 100644
--- a/python/langsmith/run_trees.py
+++ b/python/langsmith/run_trees.py
@@ -32,12 +32,14 @@
 
 
 # Note, this is called directly by langchain. Do not remove.
-def get_cached_client() -> Client:
+
+
+def get_cached_client(**init_kwargs: Any) -> Client:
     global _CLIENT
     if _CLIENT is None:
         with _LOCK:
             if _CLIENT is None:
-                _CLIENT = Client()
+                _CLIENT = Client(**init_kwargs)
     return _CLIENT