Well, I´ve been looking through several ICAO-documents and annexes.
The only thing that was comming close was this quote from Doc 4444; Chapter 4; 4.5 AIR TRAFFIC COTROL CLEARANCES; 4.5.1 Scope and purpose;
4.5.1.5 ATC clearances must be issued early enough to ensure that they are transmitted to the aircraft in sufficient time for it to comply with them.
Hope that helps a bit.
All the best
Pika