Increase timeout to avoid error when tests are run on github

Author: birgits

example/test_examples.py

@@ -69,7 +69,7 @@ def _notebook_run(self, path):
                 "--to",
                 "notebook",
                 "--execute",
-                "--ExecutePreprocessor.timeout=60",
+                "--ExecutePreprocessor.timeout=600",
                 "--output",
                 fout.name,
                 path,