diff --git a/tools/internal_ci/windows/grpc_basictests_csharp.cfg b/tools/internal_ci/windows/grpc_basictests_csharp.cfg
index 17a362fb32a..459f3c63924 100644
--- a/tools/internal_ci/windows/grpc_basictests_csharp.cfg
+++ b/tools/internal_ci/windows/grpc_basictests_csharp.cfg
@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
-timeout_mins: 60
+timeout_mins: 90
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"
diff --git a/tools/internal_ci/windows/pull_request/grpc_basictests_csharp.cfg b/tools/internal_ci/windows/pull_request/grpc_basictests_csharp.cfg
index e1c5af108ec..e5815b3cd71 100644
--- a/tools/internal_ci/windows/pull_request/grpc_basictests_csharp.cfg
+++ b/tools/internal_ci/windows/pull_request/grpc_basictests_csharp.cfg
@@ -16,7 +16,7 @@
 
 # Location of the continuous shell script in repository.
 build_file: "grpc/tools/internal_ci/windows/grpc_run_tests_matrix.bat"
-timeout_mins: 60
+timeout_mins: 90
 action {
   define_artifacts {
     regex: "**/*sponge_log.*"