The January page of a leap year is shown. In which year after it will the whole calendar repeat for the first time?

A leap year repeats only when the next year starting on the same day is also a leap year. Leap years after 2028 move the start by 5 days each four-year step (1 + 1 + 1 + 2), so the start comes round only after 7 steps: 28 years, giving 2056. (2033 starts on the same day but is not a leap year.)