@@ -236,6 +236,8 @@ def ipython_in_subprocess(requested_backend_or_gui_framework, all_expected_backe
             expected_backend = backend
             break
 
+    if is_ci_environment():
+        timeout *= 6
     code = ("import matplotlib as mpl, matplotlib.pyplot as plt;"
             "fig, ax=plt.subplots(); ax.plot([1, 3, 2]); mpl.get_backend()")
     proc = subprocess_run_for_testing(
@@ -247,6 +249,7 @@ def ipython_in_subprocess(requested_backend_or_gui_framework, all_expected_backe
         ],
         check=True,
         capture_output=True,
+        timeout=timeout,
     )
 
     assert proc.stdout.strip().endswith(f"'{expected_backend}'")