lol oh...you mean this?
So using Windows Calender..
I was born Presidents Day(1990) - Then 6 Years later it lands on it again.
(Which is a Monday) Then 5 Years .. Then 6 Years again.. then 11 Years.. Then back - So 6,5,6,11, Repeat.
11 + 6 + 6 + 5 = 28
I have 11(10) Years before It lands on the monday again.
17 + 11 = 28 ((This now would be 18 + 10 = 28))