Replacing an inherited Royal Navy battle fleet

How many generations would it take Britain to replace twenty battleships and eight battlecruisers?

Roughly nine to ten years with four ships ordered annually, or twelve to fourteen years under a more measured program.

A fleet of twenty battleships and eight battlecruisers could be replaced by ordering four capital ships per year, but three-year construction times delay the actual turnover. An aggressive program would take roughly nine to ten years, or twelve to fourteen years if orders were spread more evenly. Four annual orders were within British industrial and financial capacity in the scenario.