Since your starting BMI was a 43, I think you are probably with me in the "little big girl" category. Folks who have more to lose will lose faster; they just will. But, since you are starting smaller, you will still get to your goal fairly quickly.
I have set my expectations at losing 10 lbs per month; If I hit something close to that, I will be thrilled. And hey, at that rate, in December, I should be a size 6. I haven't been a size 6 since I was 17 years old, so I guess I can wait another eight months.
Remember, you didn't put this on overnight, it won't go away overnight either. The sleeve is a tool, not a magic wand.