Why is this funny?

A friend asked me at work today how many days were left until my retirement, I told her 24.  That's just work days, I haven't included weekends.  She laughed and seemed surprised that I actually had counted the days.  Why is that funny?  Little kids (and not so little kids) count down to Christmas and Birthdays and the end of school years. Believe me, this is just as momentous to me, so I shall not apologize for counting.  However I have not calculated hours and minutes yet.  I do have some self control.