Nothing that I know of. Like any other clearance, it stands until amended or cancelled.
That said, there is some guidance - aimed at preventing runway incursions - that has some recommendations about not lining an aircraft up until it can go and not issuing a t/o clearance a long time before the aircraft gets to the runway. Like any other guidance, it needs to be read in context and these particular bits always seemed to be some of the poorest parts of the guidance doc.
Last edited by Spitoon; 25th Feb 2013 at 08:33.