How long it takes to lose weight (30 lbs) with xenical and exercise?

It depends ... On how many calories you're eating and to some extent how much exercise you're doing. Losing 1-2 pounds a week is a reasonable rate. To keep the weight off it's important to make permanent changes to your diet and activity levels. Exercise is very important for maintaining weight loss. Xenical has been shown to help weight loss, but it's not a permanent solution. Find reasons to stay motivated.