The Beatles legend was hospitalised in Japan in May after he fell sick with a virus, prompting him to cancel the rest of his Asian tour and push back his planned dates in the US.
McCartney returned to his native UK to recover, and was later pictured bouncing back to health on a sun-soaked holiday with his wife Nancy Shevell in Ibiza, Spain before restarting his American tour on 5 July.
The 72-year-old musician has now revealed he actually enjoyed his sick leave as he relished the chance to rest and recuperate.
He tells Rolling Stone: "People say to me, 'Aw, that must have been terrible for you.' Well, no, actually. No one ever tells me to rest! It was like summer holidays in school or something. I thought, 'Yeah, I can get into that'. I just took it really easy at home in England..."
McCartney reveals he had time to read a film script written by his son, experiment with some new music, and take up jogging before heading off on a vacation.
He adds: "One part of this rest program was, I said to Nancy, 'Hey, we can take a holiday! A real holiday, where we go away.' So we went away to Ibiza."