Hmmm you asked a question with to many variables for an exact response.

But here is a quick summary: It depends on the u/l speed of the host(s) you are getting it from. For example if it is a single host, and that host is dialup it may take some time, as they will only be able to u/l at from 0-7 KB/s max., more likely 2-3 KB/s. And the more hosts u/ling the file the faster it will go.