I think my 4GB cloned in about 4-5 hours or so. I kicked it off just before I had to go out at 2pm, and it finished shortly after I got home, around tea-time.

The computer wasn't doing anything else for most of the time, but as it got close to the end I was downloading beta-11c while it was cloning.

The two empegs were the only USB devices connected at the time though.

Geoff
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Got one of the first Mark 2 empegs...
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Geoff
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Mk1 Blue - was 4GB, now 16GB
Mk2 Red - was 12GB, now 60GB