My BMI was around 33 when I got my band done, to be honest I didn't do much to help my weight loss and went 6 months at one point without a fill but shed a lot of my weight in the first 11 months. I let the band do ALL the work. If I had put in some effort I could have lost all my weight by then. The speed you loose the weight is dependent on a lot of different factors, your metabolism, your food choices, how active you are, your age etc the band has far exceeded my expectations. My weight loss has been up and down a bit the last 6 months as I am learning restriction again due to a total defill 6 months ago, my body is reacting different to the amount I have in now so its a whole new learning curve, I get a fill then it is too much, I loose a lot of weight, need a defill then gain again and go back a month later for a smaller fill than the last one etc.
I have noticed posts from people on here that are eager to feel restriction which is understandable but PLEASE DO TAKE CARE AND LISTEN TO YOUR FILL PROVIDER, A FILL OF 0.5 CAN REALLY PUSH YOU OVER THE EDGE IF YOU ARE CLOSE TO RESTRICTION. Its better to go back and get more than have to search for an emergency defill which can cost double the amount of a fill depending on where you go then you are further back than ever.
Good luck on your journey
Heather