How long would it take to reuse a calendar?

Except for when the 28-year cycle is disrupted by a non-leap century year, the rules are as follows:

A leap year will repeat itself after 28 years.

The first year after a leap year repeats in a 6-11-11 pattern. This means it will repeat after 6 years, then after 17 years, and then after 28 years.

The second year after a leap year repeats in a 11-6-11 pattern. This means it will repeat after 11 years, then after 17 years, and then after 28 years.

The third year after a leap year repeats in a 11-11-6 pattern. This means it will repeat after 11 years, then after 22 years, and then after 28 years.