How long does it take to migrate mac to mac via USB

I have the new 27inch iMac, and I am migrating via a USB from my 2008 imac running the latest Mac OSX Lion. It seems to be taking forever.
It is still telling me 24hrs 31 hinutes after 1.5hrs to transfer 320G. Does this sound right? It seemsnot to be moving in time to complete.

Don't use WiFi
Here are the maximum transfer speeds for each connection type
WiFi       300Mb/s (actual rate closer to 50Mb/s depending on distance to source, terrain and error correction)
FW 400  400Mb/s
USB2     480Mb/s
FW 800  800Mb/s
Ethernet1000Mb/s (Cat5 cable)
USB3     5000Mb/s
TBolt     10000Mb/s
In all cases real world speeds tend to be lower but a direct Ethernet connection is fast and reliable. 4 hours plus is not unusual, there is more work going on than just transferring files.
PS: in the case of a connection using 2 methods (eg: FW400 to FW800) the transfer is at the lowest of the 2 speeds, not the highest.

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