An Anglo-French naval war in 1912

How long would a war between Britain and France in 1912 last, and how long would the French navy survive?

The French navy might last only about six weeks, while the wider war would turn on colonies and possible German involvement.

The French navy is given about six weeks against Britain in the 1912 counterfactual. Defeating the fleet would leave the duration of the wider war unresolved. Britain could take French colonies and then decide how to proceed against France itself. An alliance with Germany and a German land invasion would produce a different route to ending the war.