3G Data Cards

[nizza35]

I am thinking about getting a 3G data card for my laptop. I would only be able to afford the 75mb option so I was wondering if anybody can guess how much surfing time that would allow me? Obviously not including downloads if I were just to look at web pages. If anyone can think of a better option to get my laptop wireless please let me know. I have an armada m700 with a intel III procesor. Many thanks!!