I drank a lot of hard alcohol on Sat night, probably until 12 midnight, and I have a drug test today where they will most likely test me for alcohol. I can test as late as 530pm. I believe that I will be 113 hours since drinking. Will I pass?

Can't really answer if you will pass or not. What we can say that, with regards to current technologies in ETG/ETS testing, you have a good chance of testing negative. Though there are circumstances that, even after 113 hours, you will still test positive. It has happened though it is rare.

I have a question for you, what do you stand to lose if you fail this test? Considering you're prohibited from drinking it would have to be something serious.

I could lose custody of my children:(

I am in recovery and I am taking this very seriously. I regret my decision to drink immensely. I now realize that I have a serious problem and that I need help. Any person who is not an alcoholic wouldn't have taken such a big risk especially when it involves their children. I am so anxious and scared and am just hoping to have another chance at staying clean and sober for life.

Have you looked up local AA chapters? It might be a good startign point. Chances are you will pass but you need to address your addiction and find a good way out to.