I have a Macbook Pro with an SSD and an external Firewire 800 7200RPM drive. I cloned 210GB of data from the MBP to the ext drive. It took 1 hour and 10 minutes.
Firewire 800 transfers at 780Mbs, which translates to 5820MB per hour or 582GB per hour. I got less than 1/2 of that in an hour. The 7200RPM drive and SSD factor in. How do I get some idea on how fast the actual transfer rate was?