I have the same goal, too - six-pack abs. I set my timeline for this goal to 9 months from now, though it may happen earlier. According to the calculator at , which is just a rough estimate, I have 15.0% body fat today. 177cm height, 82.9kg weight, 42cm neck, 87cm waist. BMI is calculated at 26.5. By pulling fat with my hand and doing a mental estimation, I still have between 5-8kg of fat to lose on my thighs, stomach, and back. Losing the last bits is really slow and hard work. You can play around with the calculator to see where you need to be to have less than 10% bodyfat, just change the weight and waist measurements and click the calculate button again.
Abs are made in the kitchen, not the gym. Revealing your six-pack is 80% diet and 20% exercise. This is a hard pill to swallow, but 500 crunches (or hours in the gym) a day will not reveal your six-pack - your diet will. Eat the right diet, and you only need 40 crunches a day to have nice abs. Eat the wrong diet, and no amount of exercise in the world will reveal them. I didn't even have visible abs at 77kg when I was in the army and we did heavy workouts and long runs nearly every day, but I didn't control my diet at all. I ate anything I wanted to eat and for me, that has always meant high carbs.
Time for a reality check: managing insulin levels with a low carb diet will reveal the six-pack.