How long did it take you?

Hi everyone. I'm new to this forum and have been trying to find an answer to this question before starting my own post but anyway, here goes. I live in the Philly metro area right now but am looking to go back to school and relocate to the DC-Virginia area with my brother this summer. I'm hoping to get an LPN position at one of the base hospitals/medical centers there, either Air Force or Navy...but I'm open to Army med command too. I'm just looking for a civilian job, though. First question is how long does the process take? I'm trying to determine when I should start applying because I'm out of town and also registering for an advanced clinical skills course that won't end until early June. Second part of this qustion is how are the interview processes under each branch? Hope you guys can help. Thanks!