the answer was (paraphrasing) “not six decades, not five decades. Maybe in a couple decades we’ll have a functioning plant”
edit: You were correct. The "not" before the "five decades" was spoken muted and I missed it.
Dr. Budll talking - "... probably decades, uh not six decades, i don't think, i think not five decades, which is what we used to say, i think it is moving into foreground... "