Lag,

If you can expand your vacation to touch a long trip, there is no limit to how much vacation time you burn. If it is more than what you have in your bank for 2010, you will be docked that time from next year's vacation. If you have a string of 6 CH trips, the system will only permit you to use one extra vacation day (6CH) over what you have for the end of NOV. If you have 8 days, you can burn 9 days regardless how many hours you have left in your vacation bank.

I hope this helps. I lost 10 CHs a few years ago and I am still steamed at myself.