Most US jobs only give you 10 vacation days
between 4 for Peseach, 2 for Shavouth , 2 for Rosh Hashanan, 1 for Yom Kippur and 4 for Sukkoth, thats 13 days. usually you get lucky and some of those days occur on a Shabbos, Sunday (Or Memorial Day for Shavouth). You dont have days left for Chol Hamoed especially if you try to take off for Purim and Tisha B’Av as well