How long 12-inch dreadnoughts might last without World War I

How long would the Royal Navy keep its 12-inch dreadnoughts if World War I never happened?

Probably not as long; continued annual construction would send them to reserve and disposal sooner, though some might move to Dominion fleets.

Without World War I, the Royal Navy would be expected to continue building roughly four or five dreadnoughts each year. That steady flow of newer ships would make the earliest 12-inch-gunned classes obsolete more quickly, first moving them into reserve and then out of service. Some might be transferred to Canada or Australia if imperial fleet requirements still justified the numbers. Their fate would therefore depend less on physical age than on the uninterrupted pace of replacement construction.