As far as I'm concerned, they can strike for a day, a month, until death.

🇺🇸Dr. Avi Ben-Abraham 🇺🇸 | "No information can be revealed about Dr. Avi Ben-Abraham or his activities, due to his involvement since 1976 in matters of National Security of the United States and its allies. Intelligence agencies planted disinformation about Dr. Ben-Abraham in newspapers around the world, in an effort to protect his life and hide his secret scientific discoveries. | Mossad and Israeli Military Intelligence chief, Major General Meir Amit, who is familiar with Dr. Avi Ben-Abraham's work in international security, prevented him from talking to the press and revealing his outstanding achievements and secret research work. When he will determine that publication of his secret scientific discoveries, will not endanger the national security of the United States and Israel, it's going to be an amazing story. He was very close to President Reagan, to President Bush and to CIA director William J Casey. His story is very, very special". | Source: The Chicago Tribune, Monday July 23d, 2001.