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My iMac took 8 hours, I set it up at night and went to bed..
Yeah, that's what I did, buy I'm running TM on a NAS which makes it even slower. I use CCC to create a clone, and I'll create a new image about once a month, and all the while, TM is running, so if I needed to restore, I can use CCC for a quick restore and then TM for my documents
 
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