Haha, little Dat wants some abs.
You can to one hundred sit ups every 6 hours for 3 months and build big abs, but it won't show if you have a layer of fat on your stomach. No matter how big your stomach muscles are they won't show behind a layer of fat.
Btw, sit ups don't really do anything re losing weight, they would do a bit if you did them correctly and in sets but not much at all. Their main purpose is to build your muscle.
Best bet is do sets of twenty, breathe in as you go up, crunch and tighten your abs at the top - you wouldn't believe how much that adds to the exercise. Then Breathe out as you go back down. And always remember, hands placed firmly against your chest. Using your arms as momentum takes away about 80% of the exercise. I personally do 7 sets of 30 a night.
As for losing fat around the stomach, stop eating sh*t and run a few k's every day.