Well assuming you are not talking about blank holidays there are 22 pure year that you get off. Minus one for the fourth of July would be 21. There are 52 Sundays in a year (as there are 52 weeks in a year), with the slight possibility of a 53 Sunday. I'm going to assume that one wouldn't count though since it occurs every six years (hence leap years).
52+21=73
73 x 17.4 = 1,270.2
1,270.2 x 9 = 11,431.8
11,431.8 dollars yearly.
But to answer your question, there is no real way to answer it because I can't assume you participate in every holiday therefor a "bi-weekly" answer is unpredictable. Sorry I couldn't help you all the way but maybe this will give you a start :)
