Agreed with everything above. For example in my Unit I've got soldiers who have worked 12 days or so, and a couple who are available for everything who just broke 100 class A days. Depending on what courses you take in the summer or what staff position you get, you could easily tack on another 30-90 class B days.
Seeing as how you appear to be brand new, and assuming you are available for everything going at you rank level, I'd say as a minimum, you can probably get 60 total days your first year (also depending on how many other in your Unit are available for work too). Once you get your military drivers license, you can usually get a lot more days if you are available.
That's probably as good as you are going to get. Short answer is it depends on a lot of factors. Note: If you are joining only for the money, you'll be sorely disappointed until you are at least trades trained and able to either drive or teach.