How long should it take for ear lobe piercings I got two days ago to close up if I took the earrings out?

I got a second ear piercing in each earlobe two days ago. How long should it take for the holes to close up if I took the earrings out? I don't really like the placement (had them done at Walmart) and one of them is in a little crooked. I'd like to have them redone... Is this a bad idea?