Hmm, that's odd. This is normal operation of IE, as it is attempting to ensure an out-of-control script doesn't lock up the browser. But the TD attempts to increase this timeout each time it runs in order to avoid this annoyance.
If you want to try yourself and are familiar with the registry editor (regedit), you can check/modify the value yourself. It is:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Styles\MaxScriptStatements
The TD sets this to FFFFFFFF (in Hexadecimal) to minimize any timeouts.
Edit: you may have to create the "Styles" key and then the "MaxScriptStatements" key underneath (as a DWORD value).