MaxKts is wrong!

If you have 14 days of vacation you can knock out the Rdays up to that hour value. You must knock out number of Rdays of your vacation. In other words you have to knock out 14 Rdays with 14 days of vacation (in case you want to bank some vacation for buy back).

Lets say an rday is worth 4hrs. The min you can knock out is 14 x 4 = 56hours.
If you want max out your 14 days you can knock out 84 hours of rdays 14 x 6 = 84hours (two weeks vacation)
84/4(rday value) = 21 days if you want max days off.

You do not have to have a continuous string to knock out the max amount, they will usually honor your request it just can't be in the middle of a rday block.