Ok, I know the question is somewhat subjective. I am just looking for a ball park estimate from a real world environment, not a calculation.
Here is the equipment...
Quad Core Xeon 2.8Ghz, 2GB RAM, SAS 146GB 15K RPM Drives, Windows 2008 R2 Full Install/Not Core, 1GB NICS.
All that is between the two servers is a 24 port 1gbit switch. All ports are set to Full Duplex 1000bit. Minimal traffic on the switch and servers.
Using Windows Explorer copy a 10GB file from server A to B.
How long does it take?