It depends on your connection, the connection of the user(s) you are dlding from, how many uploads this (these) user(s) have going on and how many files you are dlding at the same time.
Ideally, you should dld from a T3 or Higher, with no other downloads going on. (I say ideally because, if you're not careful with T3s, you could end up dlding a fake file or worse. Generally, T1s and Cables/DSLs are safer)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-