You will reduce by 5km :-)
2 hours per day?
You could walk five miles a day and gain weight. Losing weight depends on eating less calories than you expend. Walk or run if you can run without injury and eat less, means you will loose weight.
IF YOU WALK 20000 steps a day it really depends on how much you weight and eat if you eat smaller portions of what u normally eat then you may loose weight but if you walk them steps every day you want gain weight
They walk a lot
It's is impossible to say because how long you have to walk will depend on how many calories you ingest, how fast you walk, and how much you weight. However, an average person must walk about 5 miles per day every day to burn the equivalent of a pound of fat.
sure it does
Your body can change its weight as much as 6 pounds a day.
If you walk 30 minutes a day or 1.5 miles you will loose 1/2 lb per day - that counts to 100 calories - does not seems much but it is a lot and also it is hard to keep it up.
how much you want to
We can't estimate without knowing how many calories you're taking in, and the intensity of your exercise.
if run 2km per day how much weight do you lose in a day?
It doesn't matter much on how long you walk but more with how far you walk. For example if you were to walk a total of 10 feet in 45 minutes it would not help you much. Another point to look at is that you may reach a point that muscle gain may partially(or fully, i dont know)make up for your weight loss. While you may be dropping waist sizes your weight could go nowhere.