check this prior posting regarding feb interviews:
i wouldn't recommend taking two months completely off as that will just delay when you finish your fourth year. i took dec off and then did a research month in january as this gave me a lot of flexibility. Because i took that month off, though, i won't finish until the end of april. i have some friends who are already done and it is painful to see them not having to go in anymore.
unless you are planning on doing a ton of interviews as i did (>20) because of the couple's match, you should be able to interview during easy rotations and not waste that time on vacation. many interviews are on sat so you won't miss anything then anyways.