It takes around 1 hrs 20 min. To download 600 mb movie, wheres on my 512 kb wired broadband takes 3 hrs, so definitely better than wired one. Also you dnt have to worry abt no internet due to faulty line or repairing which is so common in mtnl wired line.As far as stability, I am facing disconnection but not before 5-6 hrs. which I doubt due to overheating of USB modem. 200 gb cap is for one month, I heard this in other forums.