Back in the late ninties I was operating in north eastern China near Tianjin. One of my FOs required some procedural continuation training so I organised training ILSs with Tianjin International Airport.
The pattern was quite large and was taking about fifiteen minutes a circuit. As we came down the slope on the second I could hear a Bulgarian IL 62 calling for start clearance for somewhere in Eastern Europe. He was told to standbye and then I was asked how much longer I required for my training. I needed two more circuits so I replied that I needed half an hour.
"Understood: Bulgarian IL 62; start delayed thirty minutes."