Tightening my stomach/abs up?

So i'm a 20 year old male, 5'10 and 155lbs apparently my bmi is 23 which is in the "healthy" range. My arms and legs are tight and lean and so is my chest, but my stomach is kind of flabby and i'm over it. It's flat all over but you can't see abs. I've read that you have to reduce the overall fat in order for abs to show, so I've been jogging 2 miles every day and doing 200 crunches every other day (or until they aren't sore anymore) for the past week and a half. I'm starting to notice my stomach tightening already which is good. I don't necessarily eat bad food, but I don't eat really healthy either. I consume around 1700 calories a day and most of the food is low fat. Anyway, is it totally unrealistic for me to expect my stomach to look tight-ish within the next month. Or is it going to take more like 3-4 months? Any advice is appreciated. I just need any sort of time-frame since i'm not exactly a fitness person. Thanks