Probably they are not away very long. Probably 1 - 3 years at most. But even on these times for child already one year was long time.
maybe even less, after all I doubt that Edward wants to keep his son exposed to the dangers of war for too long, he will probably accompany him so they will only stay for the first military season ( therefore maximum 1 year ) then for the other subsequent war campaigns I think he will postpone him in England before the arrival of winter, so that he can practice government with his uncle Edmund ( who, let's remember, is returning home ) so it will be something like 6 months in France, following his father, and 6 months in London to practice with the management of a kingdom
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