Should Migration Assistant be this slow?

Hey gang-
Just got a brand new late-2013 iMac to replace my mid-2007 iMac.
Migration Assistant is currently in progress, but I'm amazed at how slow it is going.   It started about 30 minutes ago and is showing 36 hours 45 minutes remaining!   The source computer is a mid-2007 iMac and the new machine is a 27" late-2013 iMac Core i7.   The drive on the old iMac is 650 GB capacity with about 600 GB data total.   The new iMac has the 3TB fusion drive.
The 2007 iMac is in Target Disk mode and connected via its Firewire 800 port to the new iMac's Thunderbolt port using an Apple Thunderbolt to Firewire adapter.
I've done many such migrations over the years and never seen one this slow.   Any thoughts?
Thanks!
Dave

Thanks everyone!
As it turned out, the Migration actually took just over 6 hours.   For the first two hours, the 35+ hour estimate persisted.   Then suddenly it changed to about 3 hours.   Then back to 30+ hours!   Finally the estimate seemed to fall in line with the progress bar for about the last hour.   Not too bad I suppose for about 600GB of data and the move from Lion to Mavericks.
All in all the migration seems to have worked very well.  I guess the bottom line is don't be too concerned by the time counter unless the progress bar seems stalled for a long time as well.
Thanks again!
Dave

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