Prince William will not have Prince George, 10, take on official duties until “he is well into his 20s”, according to royal author Robert Hardman.

The author of The Making of a King: King Charles III and the Modern Monarchy argued the Prince of Wales wants to ensure his heir is aptly trained before he becomes a working royal.

He cited sources close to William and Kate, the Princess of Wales as he claimed the future king views preparing George for his institutional role as one of the most important duties he holds.

Hardman wrote: “Prince George will not be expected to undertake any royal duties until he is well into his 20s.

“Quite apart from all his duties as Prince of Wales, Prince William has what he regards as one paramount duty. It is one which some of his predecessors virtually ignored: training the heir.”

A friend told the royal author that preparing George for the demand of his future role is “not far off the most important job”, William has.

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The Prince of Wales himself benefitted from personal training from both the late Queen and his father King Charles when he was younger.

Starting at the age of 13, William would regularly have one-on-one meetings with his late grandmother at Windsor Castle to learn about the job.

Author Katie Nicholls said that their time together also allowed the then-teen to unload and speak freely with the Queen.

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She wrote: “He would have one-on-one time with his grandmother to talk about whatever was on his mind. She was there for him to unload on.

And Kate, 42, who was admitted to the London Clinic on Jan. 16, also requested privacy as she heals.

“The Princess of Wales appreciates the interest this statement will generate,” the statement continued. “She hopes the public will understand her desire to maintain as much normality for her children as possible; and her wish that her personal medical information remains private.”

Kensington Palace subsequently confirmed to NBC News that her condition was non-cancerous.