How much time would elapse between a soldier's capture and a telegram to next of kin?

I don't know if there was a standard time, particularly for units that may not have much contact with their headquarters. I recently read the experience of a pilot shot down over France and it was very important to him that he return to his unit within 10 days because he knew the telegram would be sent to his wife if he was still unaccounted for after that. He made it.