Index: /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py
===================================================================
--- /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py	(revision 84633)
+++ /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py	(revision 84634)
@@ -2969,7 +2969,9 @@
                     asArgs = [ sCmd, sFileName, "--end-marker" ];
                 ## @todo Check limits; on Ubuntu with 256KB IPRT returns VERR_NOT_IMPLEMENTED.
+                # Use a higher timeout (15 min) than usual for these long checks.
                 atExec.append([ tdTestExec(sCmd, asArgs,
                                            afFlags = [ vboxcon.ProcessCreateFlag_WaitForStdOut,
-                                                       vboxcon.ProcessCreateFlag_WaitForStdErr ]),
+                                                       vboxcon.ProcessCreateFlag_WaitForStdErr ],
+                                           timeoutMS = 15 * 60 * 1000),
                                 tdTestResultExec(fRc = True) ]);