The answer is the one you want. For VTO's, it is irrelevant what you have in your vacation bank. If you have 8 days of vacation in the July bid month, that will be 48 credit hours towards your VTO. However, if it is your last vacation of the year and your bank is negative, you can request that your vacation period be reduced. I think you can reduce it down to just one day, should you choose. Then again, it's the summer, so nobody wants to do that.