There has been a DP 1.2 serial run the past two winters. Expect trg from start (BMOQ) to finish (DP 1.2) to take a total of two years, give or take.
After DP 1.1 you'll be a qualified Pl Comd, and as such will be employable in a variety of jobs. If there is a large gap between DP 1.1 and 1.2 expect to be farmed out to a trg centre. However, until you have completed DP 1.1 your employment opportunities are limited. Not to say you won't be busy, but do not expect to be given a leadership role (ie. course officer) until you have graduated DP 1.1.
Your experience on PAT Pl can vary. Generally it is a great opportunity to get quality PT in.
Hope this helps.