How many miles do you walk a day to lose lots of weight?

Any attempt at weight losshas to start with controlling what you eat, as the foods we have available today can be so high in calories. If you aren't controlling your intake it's pretty much impossible to exercise any weight away.

Then it depends on how fast you're walking. If you're just strolling around w/o getting your heart rate up the walk won't do you much good.

But again - you've got to start with controlling your diet. Once you're able to do that and get your walks in you should be seeing some progress. 2-3 pounds/week is doable on a controlled diet.