So, based on this article tradition takes less than 70 years to occur.
Yes.
From 1500 until 1970, the English had fought with the French against the Germans, the GErmans against the French, the Germans against the Russians, the Russians against the French, fought with the Dutch, fought alongside the Dutch, fought with the US, fought alongside the USA, fought with the Spanish, been allies with the Spanish etc. etc.
In fact in 1914, English soldiers on the ships to france thought they were going to attack France :)