Nuclear Submarine Reactor Life

Question

Nuclear Submarine Reactor Life 1. With Australia now supposedly getting three 'in-service' Block 4 Virginia class submarines. What is the: a. longest period of remaining reactor life Australia could get with those submarines? b. what is the worst period of remaining reactor life Australia could get with those submarines? c. Is there an expected or most probable period of remaining reactor life Australia will get? 2. What 'reactor life' is the Submarine Agency currently using for planning purposes for each of the three platforms Australia expects?