How long will it take?

I'm 14, and I weight 210 lbs.

I'm trying to lose atleast 20 lbs.

What I plan to do (and are doing):

Tuesday, Thursday, Saturdays are weight days. I do the basic things:

Curls- 30 lbs. 3 sets of 12 reps

Tricep curls- 30 lbs. 3 sets of 12 reps

Bench press- 75 lbs. 6 sets of 12 reps (my bench is able to be raised or lowerd, I do 3 sets of 12 reps in each position, so thats why its 6 sets)

Shoulder raises- 25 lb.s for each shoulder, 3 sets of 12 reps

hats really about it for weights, but I do all that and it takes me about an hour

Monday, Wednesday, and Friday are my walking/ running days.

I walk for 25 minutes, at a speed of 3.5 mph at a 6.5 incline on my treadmill

I spend the last 5 minutes running, same incline and speed

My diet basically consists of an apple for breakfast, salad, turkey sandwich and another apple for lunch (when I'm at school) and whatever my mother makes for dinner (my mom usually makes healthy stuff, she helping me)

I make sure to drink alot of water, I take two bottles to school to drink, drink a glass before school, and then I have atleast 3 from the time of when I get home to when I go to bed.

How long do you think it'll take me to reach my goal? I've been doing this for about a week and a half, and plan to continue.

Thanks!