if i do 100 curl ups a night how long will it take for me to get a nice flat stomach?
im almost 17 years old and im skinny, but like i just want a flat stomach i have like a little pouch and i want to get rid of it, im like not even 100 pounds, and im short like 5’2 maybe around there. hahaha
and i’ve been doing 100 curl ups for the past 2 days every night, how long will it take for my stomach to be nice and flat?

You will never get a flat stomach with that workout.
I tried it and i still had a gut.
What worked for me is low calorie dieting, fullbody weight training, and cardio. I got a flat stomach in about one month with this method