yourr banking windows are the set dates when you are allowed to bank a given percentage of your current years points
within the first 6 months of your use year you can bank all 100% of your current years points
with 3-6 months left in your use year you can only bank 50% of your total current years points
within the 3rd month left of your use year you can bank 25% of your current years points
last 2 months of use year yrou cant bank any of current years points
ex. feb use year 200 points
before July 31st-can bank all 200 points (100%)
Aug 1-Oct 31-can bank up to only 100 points (50%)
Nov 1-Nov 30-25% can bank up to only 50 points(25%)
Dec 1-Jan 31-0%
so if you wait until aug to decide what to do for vacation, beware you cant save 50% of points for next year