The hoops I must jump through

How long in a job should a person have to work before any sort of promotion should happen? I have been asking that for about 2 months now. I have worked at PCL since June 14th 2007. I was in the Army for 3 years and managed to get promoted 3 times. I am vying for a position within PCL called Service Coordinator. A service coordinator is a house manager, making sure all the books are good, staffing issues are taken care of, that there is money for food, and household, and that the clients are properly taken care of by direct support staff (what I currently am).
One of the things i have done to try to stand out is ask for more leadership opportunities, and being graveyard, there isn't much, but I was given the task of end of month paperwork! I think I did it correctly. I also lead meeting sometimes, but the most annoying thing I have to do is be dependable. When you are dependable, you are the one they ask to work on your day off. You get the most over time, whether you really want it or not. Your personal life suffers.
Sometimes it feels like the most I can do to impress the higher ups at work is do an outstanding job cleaning the house, and in my year and 1/2 of being there, I have had 3, soon to be 4 different service coordinator. It can get exsausting trying to impress people all over again. Well, I am finally getting the letter of recommendation from my current S.C., and that with my written letter of interest
will hopefully lead to great opportunities for me, and with my ability to support my family.

Speaking of family matters, My sister-in-law-to-be had a little girl on monday, jan 19 2009. Her name is Serenity Lynn, and she is a beautiful little baby.