Set run time expectations.

01_Training_Script.ipynb

@@ -474,7 +474,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Run the script to see that it works"
+    "## Run the script to see that it works\n",
+    "This should take around five minutes."
    ]
   },
   {